Trimmer, Joseph F., author
Houghton Mifflin , 1995
Buku Teks
Bramer, George R., author
Charles E. Merrill Publishing Company, 1981
Buku Teks
McCrimmon, James W., author
Houghton Mifflin, 1984
Buku Teks
Tyner, Thomas E.
Buku Teks
McCrimmon, James M.
Houghton Miffiln, 1963
Buku Teks