Sage, Martin
Amphoto, 1989
Buku Referensi
Kaulya
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2014
UI - Skripsi (Membership)
Syifa Haryanti Khairunnisa
Fakultas Psikologi Universitas Indonesia, 2021
UI - Skripsi (Membership)
Mackintosh, A.S.
Cambridge University Press , 1963
Buku Teks
edited by Bob Fear and Magie Toy
Wiley-Academy, 2001
Buku Teks