Crain, S., & Thornton, R. [ca. 1998]. Investigations in universal grammar : a guide to experiments on the acquisition of syntax and semantics. In Language, speech and communication [Book]. Cambridge, Mass.: MIT Press.

CRAIN, Stephen und THORNTON, Rosalind, 1998. Investigations in universal grammar : a guide to experiments on the acquisition of syntax and semantics. Cambridge, Mass.: MIT Press. ISBN 0262032503.

Crain, S., und R. Thornton. „Investigations in universal grammar : a guide to experiments on the acquisition of syntax and semantics“. Language, speech and communication, book, MIT Press, 1998.

Crain, Stephen/Thornton, Rosalind: Investigations in universal grammar : a guide to experiments on the acquisition of syntax and semantics, Cambridge, Mass. 1998.

Crain, S. und Thornton, R. (1998), Investigations in universal grammar : a guide to experiments on the acquisition of syntax and semantics, Language, speech and communication, Bd. , MIT Press, Cambridge, Mass.