Citazione Stile APA (7a Edizione)

Perkins , G., & Perkins, B. (1999). The American tradition in literature (9th ed.). McGraw- Hill.

Citazione stile Chigago Style (17a edizione)

Perkins , George, e Barbara Perkins. The American Tradition in Literature. 9th ed. Boston: McGraw- Hill, 1999.

Citatione MLA (9a ed.)

Perkins , George, e Barbara Perkins. The American Tradition in Literature. 9th ed. McGraw- Hill, 1999.