Tohutoro APA (7th ed.)

Langan, J. (1981). English Skills (2nd ed.). McGraw-Hill.

Tohutoru Kātū Chicago (17th ed.)

Langan, John. English Skills. 2nd ed. New York: McGraw-Hill, 1981.

Tohutoro MLA (9th ed.)

Langan, John. English Skills. 2nd ed. McGraw-Hill, 1981.