Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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