Arnold, Thurman Wesley
Blue Ribbon Books, 1937
Buku Klasik
Boeking, Joseph
New York, N.Y. New York Duell, Sloan and Pearce 1943,
Buku Teks
Thurman, Harold U.
Merril Publishing company , 1988
Buku Teks
Thurman, Harold V.
Charles E. Merrill Publishing Company, 1975
Buku Teks
Andrew, Thurman
Prgress Press, 1954
Buku Teks