Cita APA (7th ed.)

Cortina, J., & Elder, J. (2005). Opening doors: Understanding college reading (4th ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Cortina, Joe, i Janet Elder. Opening Doors: Understanding College Reading. 4th ed. Boston: McGraw-Hill, 2005.

Cita MLA (9th ed.)

Cortina, Joe, i Janet Elder. Opening Doors: Understanding College Reading. 4th ed. McGraw-Hill, 2005.