Last, John M., 1926-, author
Appleton & Lange, 1998
Buku Teks
Treshow, Michael, author
McGraw-Hill, 1976
Buku Teks
edited by Jonathan Rigg
Archipelago Press, 1996
Buku Teks
Knapp, Brian J., author
Longman, 1992
Buku Teks
Bates, Daniel G.
McGraw-Hill, 1991
Buku Teks