Fuller, Gordon, author
McGraw-Hill, 1972
Buku Teks
Wenwerth, George
Ginn and Co., 1914
Buku Teks
Rice, Bernard J., author
Prindle, Weber & Schmidt, 1975
Buku Teks
Buchanan, Herbert E., author
Johnson Pub., 1926
Buku Teks
Brink, Raymond
D. Appleton-Century Co., 1940
Buku Teks