Gaya APA
Engelman, Robert. (1997).
Why population matters / Robert Engelman .
Washington:
Population Action International.
Gaya Chicago
Engelman, Robert.
Why population matters / Robert Engelman.
Washington:
Population Action International,
1997.
.
Gaya MLA
Engelman, Robert.
Why population matters / Robert Engelman.
Washington:
Population Action International,
1997.
.
Gaya Turabian
Engelman, Robert.
Why population matters / Robert Engelman.
Washington:
Population Action International,
1997.
.