Siregar, Nurhalimah Br.
Fakultas Psikologi Universitas Indonesia, 2019
UI - Skripsi (Membership)
Denning, Melita
Llewellyn Publications, 1993
Buku Teks
Nanang Indriarsa
Fakultas Psikologi Universitas Indonesia, 2003
UI - Tesis Membership
Silver, Rawley
Brunner-Routledge, 2001
Buku Teks
Denning
Llewellyn Publication, 2008
Buku Teks