Cita APA (7a ed.)
Langan, J. (1985). English Skills (3.Edition.). McGraw-Hill.
Cita Chicago Style (17a ed.)
Langan, John. English Skills. 3.Edition. New York: McGraw-Hill, 1985.
Cita MLA (9a ed.)
Langan, John. English Skills. 3.Edition. McGraw-Hill, 1985.
Precaución: Estas citas no son 100% exactas.