Donnelly, J. P., & Trochim, W. M. K. (2005). Research methods: The concise knowledge base workbook. Atomic Dog Pub..
Lua i Stíl Chicago (17ú heag.)Donnelly, James P., agus William M. K. Trochim. Research Methods: The Concise Knowledge Base Workbook. Cincinnati, Ohio: Atomic Dog Pub., 2005.
Lua MLA (8ú heag.)Donnelly, James P., agus William M. K. Trochim. Research Methods: The Concise Knowledge Base Workbook. Atomic Dog Pub., 2005.
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