Keegan, Warren J., author
Prentice Hall of India, 1982
Buku Teks
Kelley, Eugene J.
Prentice-Hall, 1965
Buku Teks
Majaro, Simon
Allen & Unwin , 1982
Buku Teks
Mandell, Maurice I.
Prentice-Hall, 1985
Buku Teks
Rexroad, Robert A.
John Wiley & Sons, 1983
Buku Teks