Quadagno, Jill S.
St. Martin's Press, 1980
Buku Teks SO
edited by Clark Tibbitts and Wilma Donahue
Prentice-Hall, 1960
Buku Teks SO
Hillier, Susan
Wadsworth and Cengage Learning, 2011
Buku Teks SO
Ebersole, Priscilla
Mosby, 1990
Buku Teks SO
K. Warner Schaie, Sherry L. Willis, editor ; Bob G. Knight, Becca Levy, Denise C. Park, associate editors
Elsevier, 2011
Buku Teks SO