Designing Groupwork: Strategies for the Heterogeneous Classroom Third Edition – Elisabeth G. Cohen, Rachel A. Lotan – Google Books

https://books.google.com/books?hl=en&lr=&id=NW7lAwAAQBAJ&oi=fnd&pg=PR5&dq=Cohen+Designing+groupwork&ots=GRA5lpdOgY&sig=TZO6WKMFgh7YL3smpZSbIkeEEVs#v=onepage&q=Cohen%20Designing%20groupwork&f=false

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