Miller, Roger LeRoy, author
South Western Cengage Learning, 2011
Buku Teks
Newstrom, John W., author
McGraw-Hill, 1995
Buku Teks
Fairhead, J. N.
English Universities Press, 1965
Buku Teks
Gallwey, Timothy Josep, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Sousa, John J., author
Rhode Island Consortium, 1990
Buku Teks