Snow, Edgar, author
Jarrolds, 1934
Buku Teks
Stimson, Henry L., author
Harper & Brothers, 1936
Buku Teks
Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, 1948
Buku Teks
Hsu, Shuhsi
Kelly & Walsh, 1938
Buku Teks
Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, [date of publication not identified]
Buku Teks