APA-referens (7:e uppl.)
Frey, N., Fisher, D., & Everlove, S. (2009). Productive group work: How to engage students, build teamwork, and promote understanding. ASCD.
Chicago-referens (17:e uppl.)
Frey, Nancy, Douglas Fisher, och Sandi Everlove. Productive Group Work: How to Engage Students, Build Teamwork, and Promote Understanding. Alexandria, Va.: ASCD, 2009.
MLA-referens (9:e uppl.)
Frey, Nancy, et al. Productive Group Work: How to Engage Students, Build Teamwork, and Promote Understanding. ASCD, 2009.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.