APA-čujuhus (7. p.)
Kettley, N. C. (2010). Theory building in educational research. Continuum International Pub. Group.
Chicago-čujuhus (17. p.)
Kettley, Nigel C. Theory Building in Educational Research. New York: Continuum International Pub. Group, 2010.
MLA-čujuhus (9. p.)
Kettley, Nigel C. Theory Building in Educational Research. Continuum International Pub. Group, 2010.
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