APA Style
ESPIG, Gustaw. (1988).
Ekologi (1st edition).
Jakarta:
Yayasan Obor Indonesia.
Chicago Style
ESPIG, Gustaw.
Ekologi.
1st edition
Jakarta:
Yayasan Obor Indonesia,
1988.
Text.
MLA Style
ESPIG, Gustaw.
Ekologi.
1st edition
Jakarta:
Yayasan Obor Indonesia,
1988.
Text.
Turabian Style
ESPIG, Gustaw.
Ekologi.
1st edition
Jakarta:
Yayasan Obor Indonesia,
1988.
Print.