Baltes, P. B., & Willis, S. L. (1982). Plasticity and enhancement of intellectual functioning in old age: Penn State's Adult Development and Enrichment Project (ADEPT). In F. I. M. Craik & S. Trehub (Eds.), Aging and cognitive processes (pp. 353–389). Plenum Press.

Willis, S. L., & Baltes, P. B. (1982). Intelligence in adulthood and aging: Contemporary issues. In K. W. Schaie & J. Geiwitz (Eds.), Readings in adult development and aging (pp. 203–220). Little, Brown and Co.

Willis, S. L., Blieszner, R., & Baltes, P. B. (1982). Intellectual training research in aging: Modification of performance on the fluid ability of figural relations. In K. W. Schaie & J. Geiwitz (Eds.), Readings in adult development and aging (pp. 313–325). Little, Brown and Co.

Willis, S. L., Baltes, P. B., & Cornelius, S. W. (1981). Development and modifiability of adult intellectual performance: An examination of cognitive intervention in later adulthood. In M. P. Friedman, J. P. Das, & N. O'Connor (Eds.), Intelligence and learning (pp. 169–178). Plenum Press.

Baltes, P. B., & Baltes, M. M. (1980). Plasticity and variability in psychological aging: Methodological and theoretical issues. In G. E. Gurski (Ed.), Determining the effects of aging on the central nervous system (pp. 41–72). Schering AG.

Baltes, P. B., Cornelius, S. W., Spiro, A., Nesselroade, J. R., Willis, S. L., & Reinert, G. (1980). Integration versus Differenzierung von fluider und kristalliner Intelligenz im Alter [Integration versus differentiation of fluid-crystallized intelligence in old age]. In L. Montada (Ed.), Entwicklungspsychologie und Psychologieentwicklung: Symposium zum Gedenken an Günther Reinert, 23. Mai 1980 (pp. 40–64). Universität, Fachbereich I, Psychologie.

Baltes, P. B., & Danish, S. J. (1980). Intervention in life-span development and aging: Issues and concepts. In R. R. Turner & H. W. Reese (Eds.), Life-span developmental psychology: Intervention (pp. 49–78). Academic Press.

Willis, S. L., & Baltes, P. B. (1980). Intelligence in adulthood and aging: Contemporary issues. In L. W. Poon (Ed.), Aging in the 1980s: Psychological issues (pp. 260–272). American Psychological Association.

Baltes, P. B. (1979). Entwicklungspsychologie unter dem Aspekt der gesamten Lebensspanne: Einige Bemerkungen zur Geschichte und Theorie. In L. Montada (Ed.), Brennpunkte der Entwicklungspsychologie (pp. 42–60). Kohlhammer.

Baltes, P. B. (1979). Life-span developmental psychology: Some converging observations on history and theory. In P. B. Baltes & O. G. J. Brim (Eds.), Life-span development and behavior (Vol. 2, pp. 255–279). Academic Press.

Baltes, P. B., Cornelius, S. W., & Nesselroade, J. R. (1979). Cohort effects in developmental psychology. In J. R. Nesselroade & P. B. Baltes (Eds.), Longitudinal research in the study of behavior and development (pp. 61–87). Academic Press.

Baltes, P. B., & Nesselroade, J. R. (1979). History and rationale of longitudinal research. In J. R. Nesselroade & P. B. Baltes (Eds.), Longitudinal research in the study of behavior and development (pp. 1–39). Academic Press.

Baltes, P. B., & Willis, S. L. (1979). The critical importance of appropriate methodology in the study of aging: The sample case of psychometric intelligence. In F. Hoffmeister & C. Müller (Eds.), Brain function in old age: Evaluation of changes and disorders (pp. 164–187). Springer.

Baltes, P. B., & Willis, S. L. (1979). Life-span developmental psychology, cognitive functioning and social policy. In M. White Riley (Ed.), Aging from birth to death: Interdisciplinary perspectives (pp. 15–46). Westview Press.

Baltes, P. B., Cornelius, S. W., & Nesselroade, J. R. (1978). Cohort effects in behavioral development: Theoretical and methodological perspectives. In W. A. Collins (Ed.), Minnesota Symposia on Child Psychology (Vol. 11, pp. 1–63). Erlbaum.

Baltes, P. B., & Cornelius, S. W. (1977). The status of dialectics in developmental psychology: Theoretical orientation versus scientific method. In N. Datan & H. W. Reese (Eds.), Life-span developmental psychology: Dialectical perspectives on experimental research (pp. 121–134). Academic Press.

Baltes, P. B., & Willis, S. L. (1977). Toward psychological theories of aging and development. In J. E. Birren & K. W. Schaie (Eds.), The handbooks of aging: Vol. 2. Handbook of the psychology of aging (pp. 128–154). Van Nostrand Reinhold.

Baltes, P. B., & Willis, S. L. (1977). Adult-gerontological intelligence and learning. In B. B. Wolman (Ed.), International encyclopedia of psychiatry, psychology, psychoanalysis, & neurology (Vol. 1, pp. 284–287). Van Nostrand Reinhold Co.

Baltes, P. B. (1976). Symposium on implications of life-span developmental psychology for child development: Introductory remarks. In H. W. Reese (Ed.), Advances in child development and behavior (Vol. 11, pp. 167–168). Academic Press.

Huston-Stein, A., & Baltes, P. B. (1976). Theory and method in life-span developmental psychology: Implications for child development. In H. W. Reese (Ed.), Advances in child development and behavior (Vol. 11, pp. 169–188). Academic Press.