John Wiley & Sons, 1980
Buku Teks
O`Keefe, Patrick, 1984- , author
American Management Association;, 2008
eBooks
Wiedmann, Clark, author
Petrocelli Books, 1974
Buku Referensi
Harms, Edward, author
John Wiley & Sons, 1977
Buku Teks
Pakin, Sandra, author
Prentice-Hall, 1973
Buku Teks