APA (7th ed.) Citation

Levy, Y., & Schaeffer, J. C. (2003). Language competence across populations: Toward a definition of specific language impairment. L. Erlbaum Associates.

Chicago Style (17th ed.) Citation

Levy, Yonata, and Jeannette C. Schaeffer. Language Competence Across Populations: Toward a Definition of Specific Language Impairment. Mahwah, N.J.: L. Erlbaum Associates, 2003.

MLA (9th ed.) Citation

Levy, Yonata, and Jeannette C. Schaeffer. Language Competence Across Populations: Toward a Definition of Specific Language Impairment. L. Erlbaum Associates, 2003.