Gaya APA
Todum, H., Supriharyono., . (1992).
Ekologi sistem: suatu pengantar .
Yogyakarta:
Gadjah Mada University Press.
Gaya MLA
Todum, Howard.., Supriharyono., .
"Ekologi sistem: suatu pengantar".
Yogyakarta:
Gadjah Mada University Press,
1992.
Printed Book.