Dubin, Robert, author
Prentice-Hall, 1959
Buku Teks
Reed, Edward Wilson, 1913-, author
Appleton-Century-Croffs , 1970
Buku Teks
Lal, Rajiv, author
McGraw-Hill, 2005
Buku Teks
Bernhardt, Kenneth L
Bussiness Publications, 1985
Buku Teks
Bernhardt, Kenneth L
Irwin, 1997
Buku Teks