APA-čujuhus (7. p.)
Koba, S., & Mitchell, C. T. (2011). Hard-to-teach science concepts: A framework to support learners, grades 3-5. National Science Teachers Association.
Chicago-čujuhus (17. p.)
Koba, Susan, juo Carol T. Mitchell. Hard-to-teach Science Concepts: A Framework to Support Learners, Grades 3-5. Arlington, Va.: National Science Teachers Association, 2011.
MLA-čujuhus (9. p.)
Koba, Susan, juo Carol T. Mitchell. Hard-to-teach Science Concepts: A Framework to Support Learners, Grades 3-5. National Science Teachers Association, 2011.
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