Shin, Edysen, author
Alfa Cemerlang Edindo (AceLearnings), 2016
Buku Teks
Acuff, Frank L., author
American Management Association, 2008
eBooks
Fairbrothers, Gregg, author
Mc Graw-Hill , 2011
Buku Teks
Gordon, Adam, 1964- , author
American Management Association, 2008
eBooks
Zimmerman, Mark
Tuttle, 1987
Buku Teks