Foster, Lois E., author
Prentice-Hall, 1981
Buku Teks
Edgar, Donald E., editor
Prentice-Hall, 1980
Buku Teks
Grindstaff, Carl F., author
Christopher Publishing House, 1981
Buku Teks
Benson, Leonard, author
Random House , 1968
Buku Teks
edited Scott G. Mcnall
Little, Brown, 1968
Buku Teks