edited by Carl S. Shoup
Aldine Publishing, 1969
Buku Teks
Knox, David M., author
McGraw-Hill, 1990
Buku Teks
Cissell, Robert, author
Houghton Mifflin, 1964
Buku Teks
Cissell, Robert, author
Houghton Mifflin, 1969
Buku Teks
Weston, John Fred, 1916-, author
Dryden Press, 1978
Buku Teks