Gaya APA

al, E., Singarimbun, M. (1986). Factors affecting the use of childhood immunization in Indonesia . Bangkok: The population council, Badan Litbangkes.

Gaya MLA

al, Et., Singarimbun, Masri. "Factors affecting the use of childhood immunization in Indonesia". Bangkok: The population council, Badan Litbangkes, 1986. print.