APA (7th ed.) Citation

Brown, R. (1973). A first language: The early stages. Harvard Univ. Press.

Chicago Style (17th ed.) Citation

Brown, Roger. A First Language: The Early Stages. Cambridge, Mass: Harvard Univ. Press, 1973.

MLA (9th ed.) Citation

Brown, Roger. A First Language: The Early Stages. Harvard Univ. Press, 1973.