O`Rourke, James S., author
Prentice-Hall, 2013
Buku Teks
edited by Peggy Simcic Brønn, Stefania Romenti, Ansgar Zerfass
Emerald, 2016
eBooks
Dona Sherena Selvia, author
2016
UI - Tesis (Membership)
O`Rourke IV, James S., author
Pearson Prentice Hall, 2004
Buku Teks
Breth, Robert D.
California Addison-Wesley, 1969
Buku Teks