Cita APA

Markley, R., & Sheeler, W. D. (1983). Spot drills1: Ilustrated grammar exercises. New York: Oxford University Press.

Citación estilo Chicago

Markley, Rayner, y Willard D. Sheeler. Spot Drills1: Ilustrated Grammar Exercises. New York: Oxford University Press, 1983.

Cita MLA

Markley, Rayner, y Willard D. Sheeler. Spot Drills1: Ilustrated Grammar Exercises. New York: Oxford University Press, 1983.