Heckert, Josiah Brooks, 1893-
Ronald Press, 1963
Buku Teks SO
Heckert, Josiah Brooks, 1893-
Erlangga, 1996
Buku Teks
Willson, James D.
John Wiley & Sons, 1981
Buku Teks SO
Bradshaw, Thornton F.
Harvard University Press, 1950
Buku Teks SO
H. Mohammad Thoha
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1983
UI - Skripsi Membership