Lancaster, F. Wilfrid, author
John Wiley & Sons, 1979
Buku Teks
Williams, William F., author
Business Press, 1968
Buku Teks
edited by Morris Rubinoff
Spartan Books , 1965
Buku Teks
Fricke, Martin, author
Springer, 2012
eBooks
Alexander Sapto Utomo Putro, author
2014
UI - Skripsi (Membership)