Hadari Nawawi, author
Gadjah Mada University Press, 2011
Buku Teks
Irwan, author
Fakultas Psikologi Universitas Indonesia, 2006
UI - Tesis (Membership)
Yudin, Daniel L
Gramedia Pustaka Utama, 1999
Buku Teks
Yadin, Daniel L., author
Gramedia Pustaka Utama , 1999
Buku Teks
Artikel Jurnal