Language and Thought in Normal and Handicapped Children cover
Language and Thought in Normal and Handicapped Children
by Richard F. Cromer
ISBN: 0631145273
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After digging in a little further, it appears the primary source for the anecdote is the following book by Cromer, in a chapter called "The cognition hypothesis of language acquisition". Book:

Cromer, R.F. 1991. "Language and thought in normal and handicapped children." Cambridge, MA: Blackwell

https://www.amazon.com/Language-Handicapped-Children-Cogniti...