Toepoel, Vera, author
SaGE Publications , 2016
Buku Teks
Ullmann, Manfred, author
Edinburgh University Press, 1978
Buku Teks
Indra Freddy, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Skripsi (Membership)
Grundy, Peter F., author
Edward Arnold, 1995
Buku Teks
Marion Wesley Todd
Macmillan, 1934
Buku Teks