Citazione Stile APA (7a Edizione)

Abbs, B. A., & Freebaim, I. A. Opening strategies. Student's book. Strategies 1 (6º). Longman.

Citazione stile Chigago Style (17a edizione)

Abbs, Brian. Autor, e Ingrid. Autor Freebaim. Opening Strategies. Student's Book. Strategies 1 (6º). Londres: Longman.

Citatione MLA (9a ed.)

Abbs, Brian. Autor, e Ingrid. Autor Freebaim. Opening Strategies. Student's Book. Strategies 1 (6º). Longman.