OMS. Sample size determination in health studies. Geneva: OMS.
Trích dẫn kiểu ChicagoOMS. Sample Size Determination in Health Studies. Geneva: OMS.
ציטוט MLAOMS. Sample Size Determination in Health Studies. Geneva: OMS.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.