K. Warner Schaie, Sherry L. Willis, editor ; Bob G. Knight, Becca Levy, Denise C. Park, associate editors
Elsevier, 2011
Buku Teks
Hampton, John K.
Wm. C. Brown, 1997
Buku Teks
Quadagno, Jill S.
St. Martin's Press, 1980
Buku Teks
Cook, Ian Gillespie
Springer, 2012
eBooks
Hillier, Susan
Wadsworth and Cengage Learning, 2011
Buku Teks