Stoddard, Edward
The Dial Press, 1962
Buku Teks
Capitulo, Florante M., author
National Book Store, 1994
Buku Teks
Armstrong, James W., author
Macmillan, 1976
Buku Teks
Campbell, Hugh G., author
Macmillan, 1974
Buku Teks
Rothenberg, Ronald I., author
John Wiley & Sons, 1980
Buku Teks