Walliman, N. (2022). Research methods: The basics (Third edition.). Routledge.
Lua i Stíl Chicago (17ú heag.)Walliman, Nicholas. Research Methods: The Basics. Third edition. Abingdon, Oxon ; New York, NY: Routledge, 2022.
Lua MLA (9ú heag.)Walliman, Nicholas. Research Methods: The Basics. Third edition. Routledge, 2022.
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