Cita APA (7th ed.)

Langan, J. (1985). English Skills (tercera edición.). McGraw-Hill Book Company.

Cita Chicago (17th ed.)

Langan, John. English Skills. tercera edición. New York: McGraw-Hill Book Company, 1985.

Cita MLA (9th ed.)

Langan, John. English Skills. tercera edición. McGraw-Hill Book Company, 1985.