Blanchard, Kendall, author
Bergin & Garvey, 1995
Buku Teks
Saffar Masyhur Abdul Salam Hamid, author
2016
UI - Skripsi Membership
Ember, Carol R., author
Prentice-Hall, 1985
Buku Teks
Haviland, William A., author
Rinehart and Winston, 1974
Buku Teks
Cut Fatimah Purnamasari, author
Fakultas Teknik Universitas Indonesia, 1993
UI - Skripsi Membership