Glasziou, P., & Heneghan, C. (2009). A spotter's guide to study designs.
Lua i Stíl Chicago (17ú heag.)Glasziou, P., agus C. Heneghan. A Spotter's Guide to Study Designs. 2009.
Lua MLA (9ú heag.)Glasziou, P., agus C. Heneghan. A Spotter's Guide to Study Designs. 2009.
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