APA-viite (7. p.)
Frey, N., Fisher, D., & Everlove, S. (2009). Productive group work: How to engage students, build teamwork, and promote understanding. ASCD.
Chicago-viite (17. p.)
Frey, Nancy, Douglas Fisher, ja Sandi Everlove. Productive Group Work: How to Engage Students, Build Teamwork, and Promote Understanding. Alexandria, Va.: ASCD, 2009.
MLA-viite (9. p.)
Frey, Nancy, et al. Productive Group Work: How to Engage Students, Build Teamwork, and Promote Understanding. ASCD, 2009.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.