by William Ebenstein [and others]
Harper & Row, Publishers, 1970
Buku Teks
Irish, Marian D., author
Prentice-Hall, 1962
Buku Teks
edited by James Ward Smith and Leland Jamison
Princeton University Press, 1961
Buku Teks
McKenna, George, author
McGraw-Hill, 1998
Buku Teks
Hall, John Oliver, author
American Book Company, 1958
Buku Teks