Citazione Stile APA (7a Edizione)

Langan, J. (2000). Student CD-ROM English Skills (septima edición.). McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Langan, John. Student CD-ROM English Skills. septima edición. Boston: McGraw-Hill, 2000.

Citatione MLA (9a ed.)

Langan, John. Student CD-ROM English Skills. septima edición. McGraw-Hill, 2000.