Cavanaugh, John C.
Cengage Learning, cop, 2015
Buku Teks
Lazarus, Richard S.
Oxford University Press, 2006
Buku Teks
K. Warner Schaie, Sherry L. Willis, editor ; Bob G. Knight, Becca Levy, Denise C. Park, associate editors
Elsevier, 2011
Buku Teks
editor, James E. Birren and K. Warner Schaie
Academic Press, 1990
Buku Referensi
Schultz, Richard
Prentice-Hall, 1999
Buku Teks