Halm, George N., author
Richard D. Irwin, 1956
Buku Teks
edited by Allen N. Berger, Philip Molyneux and John O.S. Wilson
Oxford University Press, 2015
Buku Referensi
Holden, J. Milnes, author
Sir Isaac Pitman & Sons, 1960
Buku Teks
Rahma Dewi, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Skripsi (Membership)
Ranlett, John G., author
John Wiley & Sons, 1965
Buku Teks