Sommers, Christina, author
Harcourt Brace College Pub., 1997
Buku Teks
Pojman, Louis P., author
Wadsworth and Cengage Learning, 2012
Buku Teks
Andrew I. Cohen: Christopher Health Well,am
Blackwell, 2005
Buku Teks
Boss, Judith A., author
McGraw-Hill, 2004
Buku Teks
Hutabarat, Nadia Carolina, author
Universitas Indonesia, 2015
UI - Skripsi (Membership)