Jennings, Lucy Mae, author
Prentice-Hall, 1983
Buku Teks
Jennings, Lucy Mae, author
Prentince-Hall, 1983
Buku Teks
Stroman, James, author
American Management Association, 2008
eBooks
Stroman, James, author
American Management Association, 2012
eBooks
prepared under the editorial supervision of In Plain English, Inc.
Macmillan, 1996
Buku Referensi