Taft, Philip
Harvard University Press, 1954-1962
Buku Teks
Chamberlain, Neil W. (Neil Wolverton)
McGraw-Hill, 1958
Buku Teks
Delp, Mahlon
Philldedelphia: Wb sounder company , 1981
Buku Teks
Mackenzie, Gavin.
Cambridge University Pres, 1973
Buku Teks
Bayu Seno Aji
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2014
UI - Tesis (Membership)