Books
- Italian translation: La struttura della communicazione nelle prime forma del linguazzio infantile. Padua: Piccin Editore, 1978.
Articles, journals and other periodicals
Greenfield, P. M. (1998). Language, tools, and brain revisited. Behavioral and Brain Sciences.
Greenfield, P. M. (1982). The coordination of goal-directed activity and speech. Published in Russian in a psychology journal edited by B. Lomov, Director of the Institute of Psychology, Moscow.
Greenfield, P. M. (1978). How much is one word? Journal of Child Language, 5, 347-352.
Book Chapters
Greenfield, P. M. (1976). The grammer of action in cognitive development. In D.O. Walter, L., Rogers, & J. M. Finzi-Fried (Eds.), Human brain function (pp. 67-73). UCLA Brain Information Service/Brain Research Institute.