Whitman, Howard
Prentice-Hall, 1961
Buku Teks
Bowden, Tim, author
Collins, 1987
Buku Teks
Steiner, George A. (George Albert), 1912-, author
McGraw-Hill, 1953
Buku Teks
Chichester, Francis Sir
Ballantine Books, 1964
Buku Teks
Becker, Carl L. (Carl Lotus), 1873-1945, author
Alfred . A. Knopf, 1945
Buku Teks