American Psychological Association & Cooper, H. M. (2012). APA handbook of research methods in psychology. American Psychological Association.
Lua i Stíl Chicago (17ú heag.)American Psychological Association agus Harris M. Cooper. APA Handbook of Research Methods in Psychology. Washington, DC: American Psychological Association, 2012.
Lua MLA (9ú heag.)American Psychological Association agus Harris M. Cooper. APA Handbook of Research Methods in Psychology. American Psychological Association, 2012.
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