Cryer, D., Harms, T., & Ray, A. R. (1996). Active learning for fours. Innovative Learning Publications, Addison-Wesley Publishing Co..
Lua i Stíl Chicago (17ú heag.)Cryer, Debby, Thelma Harms, agus Adele Richardson Ray. Active Learning for Fours. Menlo Park, Calif.: Innovative Learning Publications, Addison-Wesley Publishing Co., 1996.
Lua MLA (8ú heag.)Cryer, Debby, et al. Active Learning for Fours. Innovative Learning Publications, Addison-Wesley Publishing Co., 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.