Gaya APA
Environment and development. (1992).
Philippine:
ORSTOM.
Gaya Chicago
Environment and development.
.
Philippine:
ORSTOM,
1992.
.
Gaya MLA
Environment and development.
.
Philippine:
ORSTOM,
1992.
.
Gaya Turabian
Environment and development.
Philippine:
ORSTOM,
1992.
.