Kierzek, John M.
Macmillan, 1946
Buku Teks
Presley, John W., author
Holt, Rinehart and Winston, 1980
Buku Teks
Steven, Laurence, author
Prentice-Hall, 1999
Buku Teks
John Hartley [and others]
Rinehart and Winston, 1962
Buku Teks
Blass, Laurie
Prentice-Hall, 1985
Buku Teks