APA (7th ed.) Citation

Villiers, P. A. d., & De Villiers, J. G. (1979). Early language. Open Books.

Chicago Style (17th ed.) Citation

Villiers, Peter A. de, and Jill G. De Villiers. Early Language. London: Open Books, 1979.

MLA (9th ed.) Citation

Villiers, Peter A. de, and Jill G. De Villiers. Early Language. Open Books, 1979.