edited by Jan De Leede
Emerald, 2017
eBooks
Hepner, Harry W., author
Prentice-Hall, 1961
Buku Teks
Asnim, author
Universitas Indonesia, 2002
UI - Tesis Membership
Stettner, Morey, author
McGraw-Hill, 2003
Buku Teks
Mosley, Donald C., author
South-Western Publishing, 1985
Buku Teks