Gaya APA
Soemartono, ., al, E. (1991).
Stratification of health centre (a case study) .
Surabaya:
Puslitbang Yantekkes, Badan Litbangkes.
Gaya MLA
Soemartono, ., al, Et.
"Stratification of health centre (a case study)".
Surabaya:
Puslitbang Yantekkes, Badan Litbangkes,
1991.
print.