Cita APA

Adamson, D., & Cobb, D. (1987). Active grammar exercises: Answer Key (1a. ed.). Harlow: Longman.

Citación estilo Chicago

Adamson, D., and D. Cobb. Active Grammar Exercises: Answer Key. 1a. ed. Harlow: Longman, 1987.

Cita MLA

Adamson, D., and D. Cobb. Active Grammar Exercises: Answer Key. 1a. ed. Harlow: Longman, 1987.