Cita APA

Adamson, D., & Cobb, D. J. (1987). Active grammar exercises: Answer key. Harlow: Longman.

Citación estilo Chicago

Adamson, D., and D. J. Cobb. Active Grammar Exercises: Answer Key. Harlow: Longman, 1987.

Cita MLA

Adamson, D., and D. J. Cobb. Active Grammar Exercises: Answer Key. Harlow: Longman, 1987.