Isaacs, Asher, 1902-1963, author
Van Nostrand , 1964
Buku Teks
edited by Ronald Bayer [and others]
Oxford University Press, 2007
Buku Teks
Buchholz, Rogene A., author
Prentice-Hall, 1989
Buku Teks
Owens, Richard N.
Homewood, Ill. Richard D. Irwin, Inc , 1958
Buku Teks
Boatright, John R., author
Pearson education International, 2009
Buku Teks