Lwanga,S.K. Lemeshow, S. (1992). Sample Size determination in health studies: A practical manual. World Health Organization.
Lua i Stíl Chicago (17ú heag.)Lwanga,S.K. Lemeshow, S. Sample Size Determination in Health Studies: A Practical Manual. Geneva: World Health Organization, 1992.
Lua MLA (8ú heag.)Lwanga,S.K. Lemeshow, S. Sample Size Determination in Health Studies: A Practical Manual. World Health Organization, 1992.
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