Jenks, Ernest E., author
Alexander hamilton Institute, 1962
Buku Teks
Baduara S, Satar
Akademika Pressindo, 1984
Buku Teks
Baduara S, Satar
Akademika Pressindo, 1984
Buku Teks
Fernald, Charles H., author
Prentice-Hall, 1959
Buku Teks
Kirkpatrick, Charles A., author
South-Western Publishing, 1976
Buku Teks