APA (7e ed.) Bronvermelding

Withrow, J. (1990). Effective writing. Writing skills for intermediate students of american english. Student' s book (4a. ed.). Cambridge University.

Chicago (17e ed.) Bronvermelding

Withrow, Jean. Effective Writing. Writing Skills for Intermediate Students of American English. Student' S Book. 4a. ed. Cambridge: Cambridge University, 1990.

MLA (9e ed.) Bronvermelding

Withrow, Jean. Effective Writing. Writing Skills for Intermediate Students of American English. Student' S Book. 4a. ed. Cambridge University, 1990.