Cita APA (7th ed.)

Pettgrew, J. (1978). Functional writing. Houghton Mifflin.

Cita Chicago (17th ed.)

Pettgrew, Joan. Functional Writing. Dallas, Estados Unidos: Houghton Mifflin, 1978.

Cita MLA (9th ed.)

Pettgrew, Joan. Functional Writing. Houghton Mifflin, 1978.