Wadsworth, 1962
Buku Teks
Niece, E.H. Mac, author
John Wiley & Sons, 1961; 1957
Buku Teks
Arifudin, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1992
UI - Tesis Membership
Ayres, Robert U., author
McGraw-Hill, 1969
Buku Teks
Hartley, W.C.F.
Business Books Ltd. , 1976
Buku Teks