Παραπομπή σε μορφή APA (7η εκδ.)

Heny, F., & Richards, B. (1983). Linguistic categories: Auxiliaries and related puzzles. D. Reidel Publishing Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Heny, Frank, και Barry Richards. Linguistic Categories: Auxiliaries and Related Puzzles. Dordrecht: D. Reidel Publishing Company, 1983.

Παραπομπή σε μορφή MLA (8th εκδ.)

Heny, Frank, και Barry Richards. Linguistic Categories: Auxiliaries and Related Puzzles. D. Reidel Publishing Company, 1983.