Hodnett, Edward
Harper & Brothers, 1955
Buku Teks
Robertson, S. Ian
Psychology Press, 2001
Buku Teks
Fox, William M
Jossey Bass, 1987
Buku Teks
Briggs, William
Society for Industrial and Applied Mathematics, 2005
eBooks
Widyatmiko Adhi Pradhana
Fakultas Psikologi Universitas Indonesia, 2014
UI - Tesis (Membership)