Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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