Citazione Stile APA (7a Edizione)

ALEXANDER, L. (1980). Question and answeer graded oral comprehension exercise. Kanisius.

Citazione stile Chigago Style (17a edizione)

ALEXANDER, L.G. Question and Answeer Graded Oral Comprehension Exercise. Yogyakarta: Kanisius, 1980.

Citatione MLA (9a ed.)

ALEXANDER, L.G. Question and Answeer Graded Oral Comprehension Exercise. Kanisius, 1980.