Guyatt, G. (2008). Users' guides to the medical literature: A manual for evidence-based clinical practice (2nd ed.). McGraw Hill Medical.
Lua i Stíl Chicago (17ú heag.)Guyatt, Gordon. Users' Guides to the Medical Literature: A Manual for Evidence-based Clinical Practice. 2nd ed. New York: McGraw Hill Medical, 2008.
Lua MLA (9ú heag.)Guyatt, Gordon. Users' Guides to the Medical Literature: A Manual for Evidence-based Clinical Practice. 2nd ed. McGraw Hill Medical, 2008.
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