Karp, Rashelle S.
Garland Publishing, Inc., 1991
Buku Referensi
Shapiro, Lawrence E.
Gramedia Pustaka Utama, 1997
Buku Teks SO
Ari Fadiati
1995
UI - Tesis Membership
Garner, Helen
McPhee Gribble, 1986
Buku Teks
Hari Harjanto Setiawan
Kementerian Sosial Republik Indonesia, 2017
Artikel Jurnal