Nelson-Jones, Richard, author
Thousand Oaks, California: SAGE, 2014
Buku Teks
Claringbull, Norman, author
Learning Matters, 2011
Buku Teks
Neukrug, Edward S., author
Brooks/Cole Cengage Learning, 2012
Buku Teks
Casemore, Roger
Sage Publications, 2006
Buku Teks
Edward C. Chang, Christina A. Downey, editors
[Springer, ], 2012
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