Gaya APA

Ferguson, L, G, A, R, B, P. (1989). Question and answer; graded oral comprehension exercises; new edition (cassette 1 and 2) . Yogyakarta: Kanisius.

Gaya MLA

Ferguson, L., G., Alexander, Revisid, By, Peter. "Question and answer; graded oral comprehension exercises; new edition (cassette 1 and 2)". Yogyakarta: Kanisius, 1989. Text.