Cita APA (7th ed.)

Lwanga S.K & Lemeshow S. (1991). Sample Size determination in health studies: A practical manual. WHO.

Cita Chicago (17th ed.)

Lwanga S.K i Lemeshow S. Sample Size Determination in Health Studies: A Practical Manual. England: WHO, 1991.

Cita MLA (9th ed.)

Lwanga S.K i Lemeshow S. Sample Size Determination in Health Studies: A Practical Manual. WHO, 1991.