Lwanga, S. K., & Lemeshow, S. (1991). Sample size determination in health studies: A practical manual. World Health Organization.
Chicago-viite (17. p.)Lwanga, S. Kaggwa, ja Stanley Lemeshow. Sample Size Determination in Health Studies: A Practical Manual. Geneva: World Health Organization, 1991.
MLA-viite (9. p.)Lwanga, S. Kaggwa, ja Stanley Lemeshow. Sample Size Determination in Health Studies: A Practical Manual. World Health Organization, 1991.
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