Anita Lie
Grasindo, 2002
Buku Teks
Slavin, Robert E.
Allyn and Bacon, 1995
Buku Teks
Artikel Jurnal
Fathia Saripuspita, author
Fakultas Psikologi Universitas Indonesia, 2001
UI - Skripsi (Membership)
Voosen, Deborah, author
[American Society for Training & Development Press, American Society for Training & Development Press], 2005
eBooks