Tohutoro APA (7th ed.)

Ogundipe P. A. & Tregidgo P. S. (1974). Practical English: A comprehensive secondary course. Book four. Longman.

Tohutoru Kātū Chicago (17th ed.)

Ogundipe P. A. me Tregidgo P. S. Practical English: A Comprehensive Secondary Course. Book Four. England: Longman, 1974.

Tohutoro MLA (9th ed.)

Ogundipe P. A. me Tregidgo P. S. Practical English: A Comprehensive Secondary Course. Book Four. Longman, 1974.