Brady M, Tsay M (2010). A case study of cooperative learning and communication pedagogy; Does working in teams make a difference? J. Scholarship Teach. Learn. 10(2):78-89.

Brown H, Ciuffetelli DC (2009). Foundational methods: Understanding teaching and learning. Toronto: Pearson Education.

Ifamuyiwa SA, Akinsola MK (2008). Improving senior secondary school students attitude towards mathematics through self and cooperative instructional strategies. Int. J. Math. Educ. Sci., Technol., 39:569-585. 
Crossref

Kamuran T, Fikri A (2008). The effects of cooperative learning on Turkish elementary students'mathematics achievement and attitude towards mathematics using TAI and STAD methods, Educ. Stud. Math. 67:77-91.
Crossref

Ke F, Grabowski B (2007). Game playing for math learning: co-operative or not? Bri. J. Educ. Technol. 38(2):249-259.
Crossref

Kumar A, Roberts D, Wood KE (2006). Duration of hypotension before initiation of effective antimicrobial therapy is the critical determinant of survival in human septic shock. Crit. Care Med. 34(6):1589-96.
Crossref

Mabrouk PA (2007). Active Learning: Models from the Analytical Sciences. Washington, DC: American Chemical Society.
Crossref

Mohammed K (2014). Cooperative Learning Practices in College of Education and Behavioral Sciences in Haramaya University, Ethiopia. Int. J. Sci. Res. 3(11).

Millis BJ, Cottell PG (1998). Cooperative learning for higher education faculty. Phoenix: Oryx Press.

Patton MQ (1987). How to use qualitative methods in evaluation. Newbury Park, CA: Sage

Spencer K, Miguel K (2009). Kagan cooperative learning.Kagan Publishing.

Victor J (2006). The Sage Dictionary of Social Research Methods: Sage, Publications.

Vygotsky LS (1978). Mind in society: The development of higher psychological processes. Cambridge, MA: Harvard University Press.

Yemane G (2007). The Quality of the Pre-school Education Program in West Wellega Zone: A case Study of four Community pre-schools, AAU., MA Thesis

Zakaria E, Lu CC, Yusoff Daud. Md (2010). The Effects of Cooperative Learning on Students' Mathematics Achievement and Attitude towards Mathematics. J. Soc. Sci. 6 (2):272-275.
Crossref

Zakaria E, Titi S, Yusoff D, Zulkarnain ZA (2013). Effect of Cooperative Learning on Secondary School Students' Mathematics Achievement Creative Educ. 4(2):98-100.
Crossref