Weaver, Robert C.
Buku Teks
Hongkong Polytechnic International
Hongkong Polytechnic International, 2011
Buku Referensi
Cousins, Albert N., 1919-, author
John Wiley & Sons, 1979
Buku Teks
Karp, David A., author
Praeger, 2015
Buku Teks
Francis, Robert A., author
Routledge, 2013
Buku Teks