Cita APA (7th ed.)
Henning, J. H. (1966). Improving oral communication. McGraw Hill.
Cita Chicago (17th ed.)
Henning, James H. Improving Oral Communication. New York: McGraw Hill, 1966.
Cita MLA (9th ed.)
Henning, James H. Improving Oral Communication. McGraw Hill, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.