Trotman, Kathleen M.
McGraw-Hill , 1973
Buku Teks
Houghton Mifflin , 1993
Buku Referensi
Boston: Houghton: 1993,
Buku Referensi
Stroman, James, author
[American Management Association;, ], 2012
eBooks
Morton, Joyce, author
Prentice Hall Career & Technology, 1993
Buku Teks