Cita APA (7th ed.)

Kolln, M., & Funk, R. (2010). Understanding English grammar (8th ed.). Longman.

Cita Chicago (17th ed.)

Kolln, Martha, i Robert Funk. Understanding English Grammar. 8th ed. New York: Longman, 2010.

Cita MLA (9th ed.)

Kolln, Martha, i Robert Funk. Understanding English Grammar. 8th ed. Longman, 2010.