Loughary, John W.
Harper & Row, 1966
Buku Teks
Harry B. Santoso
Penerbit Andi, 2022
Buku Teks
Fransisca Mira Hapsari
Fakultas Psikologi Universitas Indonesia, 2017
UI - Skripsi (Membership)
Päivi Tynjälä, Marja-Leena Stenström, Marjatta Saarnivaara, editors
Springer, 2012
eBooks
Diah Rini Lesmawati
Fakultas Psikologi Universitas Indonesia, 2001
UI - Skripsi (Membership)