Hirsch, Julius, author
Harper & Brothers, 1955
Buku Teks
Vance, Stanley C., author
Prentice-Hall, 1955
Buku Teks
Vance, Stanley C., author
Prentice-Hall, 1961
Buku Teks
Hansen, Alvin H. (Alvin Harvey), 1887-1975, author
George Allen and Unwin, 1944
Buku Teks
planned and edited by John George Glover and William Bouck Cornell
Prentice-Hall, 1951
Buku Teks