Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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