Cita APA (7th ed.)

Cortina, J., Elder, J., & Gonnet, K. (1995). Opening doors: Understanding college reading. McGraw-Hill.

Cita Chicago (17th ed.)

Cortina, Joe, Janet Elder, i Katherine Gonnet. Opening Doors: Understanding College Reading. New York: McGraw-Hill, 1995.

Cita MLA (8th ed.)

Cortina, Joe, et al. Opening Doors: Understanding College Reading. McGraw-Hill, 1995.