**Chapter 4**

[18] Johnson BR, Onwuegbuzie AJ, Turner LA. Toward a definition of mixed methods research. Journal of Mixed Methods Research. 2007;1(2):112-133. DOI: 10.1177/1558689806298224

Metacognition in Learning

[19] Olsen W. Triangulation in social research: Qualitative and quantitative method can really be mixed. In: Holborn M, editor. Developments in Sociology. Ormskirk: Causeway Press; 2004.

[20] Crowley ML. The van Hiele model of the development of geometric thought. In: Lindquist M, Shulte AP, editors. Learning and Teaching

Geometry, K-12. Virginia: NCTM; 1987.

[21] Tashakkori A, Teddlie C, editors. Handbook of Mixed-Methods in Social and Behavioural Research. Thousand

[22] Teddlie C, Yu F. Mixed methods sampling: A typology with examples. Journal of Mixed Methods Research.

Oaks, CA: Sage; 2003. 768 p

2007;1(1):11-100

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pp. 1-30

pp. 323-331
