Oliver, Douglas L.
Harvard University Press, 1958.
Buku Teks
Sharp, Andrew M.
Clarendon Press, 1960
Buku Teks
Daniel, Hawthorne
G.P. Putnam's Sons , 1943
Buku Teks
Tan Tai Hiong
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1994
UI - Skripsi Membership
edited by Norman and Ngaire Douglas
Angus & Robertson, 1989
Buku Referensi