James, Preston E.
John Wiley & Sons, 1980
Buku Teks
Kolevzon, Edward R.
Allyn and Bacon, 1959
Buku Teks
Israel, Saul
Holt, Rinehart and Winston, 1976
Buku Teks
James, Preston E.
Macmillan, 1972
Buku Teks
by Les Rowntree ... [and others]
Prentice-Hall, 2011
Buku Teks