Ford, William W., author
W.B. Saunders, 1927
Buku Teks
Swingle, Deane B., author
D. Van Nostrand, 1950
Buku Teks
Jordan, Edwin O., author
W.B. Saunders, 1946
Buku Teks
Ford, William W., author
Hafner Press, 1964
Buku Teks
Hare, Ronald, author
Longman, 1967
Buku Teks