Wragg, E. C. (1999). An introduction to classroom observation (2nd ed.). Routledge.
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Chicago-čujuhus (17. p.)
Wragg, E. C. An Introduction to Classroom Observation. 2nd ed. London ; New York: Routledge, 1999.
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MLA-čujuhus (9. p.)
Wragg, E. C. An Introduction to Classroom Observation. 2nd ed. Routledge, 1999.
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