Cita APA (7th ed.)
Withrow, J. (1987). Effective writing .: Writing skills for intermediate students of American English :Teacher' manual and answer key (1a. ed.). Cambridge University Press.
Cita Chicago (17th ed.)
Withrow, Jean. Effective Writing .: Writing Skills for Intermediate Students of American English :Teacher' Manual and Answer Key. 1a. ed. New York, E.U.: Cambridge University Press, 1987.
Cita MLA (9th ed.)
Withrow, Jean. Effective Writing .: Writing Skills for Intermediate Students of American English :Teacher' Manual and Answer Key. 1a. ed. Cambridge University Press, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.