Battle, Michael, author
Blackwell Publishing, 2006
Buku Teks
Margolies, Edward
Lippincott, 1969
Buku Teks
Cobbs, Price M., author
[American Management Association, ], 2003
eBooks
Littlejohn, David
Grossman , 1966
Buku Teks
Bowling Green University Press, 1971
Buku Teks