APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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