Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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