Elsbree, Willard H., author
Harvard University Press, 1953
Buku Teks
Jones, F.C., author
Oxford University Press, 1954
Buku Teks
Vandenbosch, Amry, author
University of Kentucy Paperbacks, 1967
Buku Teks
Gordon, Bernard K., author
Prentice-Hall, 1966
Buku Teks
McCloud, Donald G., author
Westview Press, 1986
Buku Teks