APA Style

al, E., Soemartono, . (1991). Stratification approach in health management system in Indonesia . Surabaya: Puslitbang Yantekkes, Badan Litbangkes.

MLA Style

al, Et., Soemartono, . "Stratification approach in health management system in Indonesia". Surabaya: Puslitbang Yantekkes, Badan Litbangkes, 1991. print.