Soetjahja, I. (1989). The Planning, implementation and evaluation of health education activities. s.n.
Chicago Style aipamenaSoetjahja, I. The Planning, Implementation and Evaluation of Health Education Activities. Manila: s.n, 1989.
MLA aipamenaSoetjahja, I. The Planning, Implementation and Evaluation of Health Education Activities. s.n, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.