Richard Y Chang, author
PPM, 2003
Buku Teks
Alfons Taryadi, author
Gramedia, 1989
Buku Teks
Tri Rahmandani, author
Fakultas Psikologi Universitas Indonesia, 2019
UI - Skripsi (Membership)
Drummond, Helga, author
Gramedia Pustaka Utama, 1995
Buku Teks
Johanes Supranto, author
Rineka Cipta, 1991
Buku Teks