Varghese, P.M.
Longman Malaysia, 1975
Buku Teks
Pramesti Andiani, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2014
UI - Tesis (Membership)
Kau, James B., author
McGraw-Hill, 1985
Buku Teks
Shilling, James D., author
South-Western, 2002
Buku Teks
Shenkel, William M., author
McGraw-Hill , 1978
Buku Teks