Korda, Michael, 1933-
Summit Books, 1989
Buku Teks
edited by Richard E. Mulcahy
Holt, Rinehart and Winston, 1967
Buku Teks
Ludwig, Emil, 1881-1948, author
Garden City Publishing, 1941
Buku Teks
Barlow, Hugh D.
Litle, Brown and Company, 1984
Buku Teks
Huetinck, Linda
Neb Cliffs Notes, Inc, 1994
Buku Teks