Cita APA (7th ed.)

Lwanga, S. K., & Lemeshow, S. (1991). Sample size determination in health studies: A practical manual. World Health Organization.

Cita Chicago (17th ed.)

Lwanga, S. Kaggwa, i Stanley Lemeshow. Sample Size Determination in Health Studies: A Practical Manual. Geneva: World Health Organization, 1991.

Cita MLA (9th ed.)

Lwanga, S. Kaggwa, i Stanley Lemeshow. Sample Size Determination in Health Studies: A Practical Manual. World Health Organization, 1991.