Cita APA (7th ed.)

Alexander, L. G. (1967). Question and answer: Graded oral comprehension exercises (1a. ed.). Longman.

Cita Chicago (17th ed.)

Alexander, Louis George. Question and Answer: Graded Oral Comprehension Exercises. 1a. ed. Londres: Longman, 1967.

Cita MLA (9th ed.)

Alexander, Louis George. Question and Answer: Graded Oral Comprehension Exercises. 1a. ed. Longman, 1967.