by Harold T. Amrine [and others]
Prentice-Hall, 1993
Buku Teks
Brown, Wilfred
Heinemann, 1971
Buku Teks
Seckler-Hudson, Catheryn, author
Washington, D.C., The American University Press
Buku Teks
Etzioni, Amitai, author
Holt, Rinehart and Winston, 1964
Buku Teks
Brown, Alvin
Prentice-Hall, 1947
Buku Teks