Citazione Stile APA (7a Edizione)

Langan, J. (2014). College writing skills (Ninth edition.). McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Langan, John. College Writing Skills. Ninth edition. New York, N.Y: McGraw-Hill, 2014.

Citatione MLA (9a ed.)

Langan, John. College Writing Skills. Ninth edition. McGraw-Hill, 2014.