Pounds, Norman J. G., author
Silver Burdett, 1980
Buku Teks
Israel, Saul, author
Holt, Rinehart and Winston, 1976
Buku Teks
James, Preston E., author
Macmillan, 1972
Buku Teks
edited by Otis W. Freeman and John W. Morris
McGraw-Hill, 1958
Buku Teks
by Les Rowntree ... [and others]
Prentice-Hall, 2011
Buku Teks