APA (7th ed.) Citation

Hornstein, N., & Lightfoot, D. (1981). Explanation in linguistics: The logical problem of language acquisition. Longman.

Chicago Style (17th ed.) Citation

Hornstein, Norbert, and David Lightfoot. Explanation in Linguistics: The Logical Problem of Language Acquisition. London ; New York: Longman, 1981.

MLA (8th ed.) Citation

Hornstein, Norbert, and David Lightfoot. Explanation in Linguistics: The Logical Problem of Language Acquisition. Longman, 1981.