Trochim, W. M. K. (2005). Research methods: The concise knowledge base. Atomic Dog Pub./Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Trochim, William M. K. Research Methods: The Concise Knowledge Base. Cincinnati, Ohio: Atomic Dog Pub./Cengage Learning, 2005.
Lua MLA (8ú heag.)Trochim, William M. K. Research Methods: The Concise Knowledge Base. Atomic Dog Pub./Cengage Learning, 2005.
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