Beck, J. Murray
University of Toronto Press, 1957
Buku Teks
Meehan, Eugene J.
McGraw-Hill, 1966
Buku Teks
Sorauf, Frank J.
Glenview, Ill. Scott Foresman and Co, 1988.,
Buku Teks
Beck, Roger
McGraw-Hill, 1978
Buku Teks
Murray, Jerome T., author
McGraw-Hill, 1988
Buku Teks