Clewer, Ann, author
Pearson Education, 1998
Buku Teks
Yulianti Prastiwi, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2014
UI - Tesis (Membership)
edited by Sharon B. Buchbinder, Nancy H. Shanks
Jones & Bartlett Learning, 2017
Buku Teks
Mooney, Gavin H., author
Pearson Education, 2003
Buku Teks
Mooney, Gavin H., author
Prentice-Hall, 1992
Buku Teks