Cita APA (7th ed.)
Hefferman, J. A. (1990). Writing: A college handbook (3rd ed.). W.W.Norton & co..
Cita Chicago (17th ed.)
Hefferman, James A.W. Writing: A College Handbook. 3rd ed. New York: W.W.Norton & co., 1990.
Cita MLA (9th ed.)
Hefferman, James A.W. Writing: A College Handbook. 3rd ed. W.W.Norton & co., 1990.
Atenció: Aquestes cites poden no estar 100% correctes.