Badke, William B., 1949-, author
iUniverse, 2014
Buku Teks
Temes, Roberta, author
American Management Association, 2009
eBooks
Humes. James C.
McGraw-Hill , 1980
Buku Teks
Scott, Gini Graham, author
American Management Association, 2009
eBooks
Budworth, Geoffrey
Jaico Pub, 2002
Buku Teks