Statistics
Cumming, G., & Calin-Jageman, R. (2027). Introduction to the new statistics. New York: Routledge.
Diez, D. M., Barr, C. D., & ?etinkaya-Rundel, M. (2015). OpenIntro Statistics, 3rd ed. OpenIntro. (free download from https://www.openintro.org/stat/textbook.php along with additional educational resources)
Field, A. (2016). An adventure in statistics. Sage. (https://edge.sagepub.com/field-an-adventure-in-stats)
Theory of science
Fay, B.(1996). Contemporary philosophy of social science: a multicultural approach. Oxford: Blackwell. Chapters 1, 6-11. Totally 147 pages.
Gall, M., J.P. Gall and W. Borg (2007). The Nature of Educational Research, in: M. Gall, J.P. Gall and W. Borg, Educational Research: An Introduction. (8th Ed.) Pearson: Chapter 1. Pp. 2-37. 35 p.
Research methods
Cresswell, J.W. (2014): Research Design. Qualitative & Mixed Method Approaches. London: Sage. Totally 240 pages
De Vaus, D.A (2002). Surveys in Social Research. An Introduction. 5th ed. London: Routledge. Chapter 1, pp. 3-7, chapter 3 pp. 22-39, chapter 4 pp. 43-55, chapter 6 pp. 69-91, chapter 7 pp. 94-119, chapter 10 pp. 163-179, chapter 11 pp. 180-186. Totally 102 pages.
Gall, M.D., Gall, J.P. & Borg, W.R. (2007) Educational Research. An Introduction. Pearson: 8th Ed. All chapters except chapter 1 which is included under Theory of science. Totally 619 pages
Compendium
The following texts are available in a compendium which is for sale from "Kopiutsalget" in Akademika bookshop, Blindern campus.
Chalmers, A.F. (1999). Theories as Structures I: Kuhn’s paradigms, in: A.F. Chalmers, What is this thing called Science? Open University Press. Pp. 104-129. 25 p.
Maxwell, J. A.(1992) Understanding and Validity in Qualitative Research. In: Harvard Educational Review, Vol. 62, No. 3. Pp. 279-300. 21 pages.
Schofield, J. W.(1990) Increasing the Generalizability of Qualitative Research. In: E.W. Eisner & Peshkin, A. (Eds) : Qualitative Inquiry in Education. The Continuing Debate. 32 pages.