Lewis, Anthony, author
Pradnya Paramita, 1984
Buku Teks
Schwartz, Louis B., author
The Foundation , 1966
Buku Teks
McGuire, Edna
Macmillan, 1961
Buku Teks
D. Reidel Publishing Company, 1984
Buku Teks
Fritschler, A Lee
Mass Ballinger Publishing , 1987
Buku Teks