Cita APA (7th ed.)

Lwanga,S.K. Lemeshow, S. (1992). Sample Size determination in health studies: A practical manual. World Health Organization.

Cita Chicago (17th ed.)

Lwanga,S.K. Lemeshow, S. Sample Size Determination in Health Studies: A Practical Manual. Geneva: World Health Organization, 1992.

Cita MLA (8th ed.)

Lwanga,S.K. Lemeshow, S. Sample Size Determination in Health Studies: A Practical Manual. World Health Organization, 1992.