1. Bardin, L. (2006) Análise de conteúdo (L. de A. Rego & A. Pinheiro, Trads.). Lisboa: Edições 70.
2. Chiu, H.; Wen, S. & Sheng, C. (2009). Apply Web 2.0 tools to constructive collaboration learning: A case study in MIS course. Fifth International Joint Conference on INC, IMS and IDC, pp. 1638-1643.
3. Coll, C. & Monereo, C. (2010). Educacion y aprendizaje en el siglo XXI. In:COLL. & C. MONEREO. C. (orgs.) Psicologia de la educacion virtual. Madri: Ediciones Morata.
4. A Reference Model for Sustainable E-Learning Service Systems: Experiences with the Joint University/Teradata Consortium;Demirkan;Decision Sciences Journal of Innovative Education,2010
5. A pilot study of cooperative programming learning behavior and its relationship with students’ learning performance;Hwang;Computers & Education,2012