Kintner, Earl W.
Macmillan Publishing Co.Inc., 1973
Buku Teks
Oesterle, Dale A.
West Publishing Co., 1991
Buku Teks
Kintner, Earl W.
N.Y. Macmillan, 1971
Buku Teks
edited by Claire A. Hill, James L. Krusemark
UK Edward Elgar Publishing, 2016
Buku Teks
Partner, Simon, author
New Jersey, Prentice Hall1991,
Buku Referensi