Gaya APA

G., A, L. (1977). Question and Answer : Graded Oral Comprehenesion Exercises (Cetakan Pertama). s.l: Longman & Kanisius.

Gaya MLA

G., Alexander, L.. "Question and Answer : Graded Oral Comprehenesion Exercises". Cetakan Pertama s.l: Longman & Kanisius, 1977. Text.