Chidsey, Donald Barr
Crown Publishers, 1959
Buku Teks
World Express Mapping Sdn. Bhd, [date of publication not identified]
Buku Referensi
World Express Mapping Sdn. Bhd, [date of publication not identified]
Buku Referensi
Wahyu Indra Budi, author
2018
UI - Tesis (Membership)
Utami Budi Rahayu Hariyadi, author
Fakultas Psikologi Universitas Indonesia, 2005
UI - Tesis (Membership)