APA (7th ed.) Citation

Mortimer, C. (1977). Contractions: A pronunciation practice book. Cambridge University.

Chicago Style (17th ed.) Citation

Mortimer, Colin. Contractions: A Pronunciation Practice Book. Cambridge: Cambridge University, 1977.

MLA (9th ed.) Citation

Mortimer, Colin. Contractions: A Pronunciation Practice Book. Cambridge University, 1977.