Gaya APA
Engelman, Robert. (1995).
Conserving land population and sustainable food production / Robert Engelman .
USA:
Population Action International.
Gaya Chicago
Engelman, Robert.
Conserving land population and sustainable food production / Robert Engelman.
USA:
Population Action International,
1995.
.
Gaya MLA
Engelman, Robert.
Conserving land population and sustainable food production / Robert Engelman.
USA:
Population Action International,
1995.
.
Gaya Turabian
Engelman, Robert.
Conserving land population and sustainable food production / Robert Engelman.
USA:
Population Action International,
1995.
.