Hulley, S. B. (2013). Designing clinical research (4th ed.). Wolters Kluwer/Lippincott Williams & Wilkins.
Lua i Stíl Chicago (17ú heag.)Hulley, Stephen B. Designing Clinical Research. 4th ed. Philadelphia: Wolters Kluwer/Lippincott Williams & Wilkins, 2013.
Lua MLA (8ú heag.)Hulley, Stephen B. Designing Clinical Research. 4th ed. Wolters Kluwer/Lippincott Williams & Wilkins, 2013.
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