Gaya APA
Spengler, Joseph J. (1975).
Population and Amercia's future .
San francisco:
W.H Freeman and company.
Gaya Chicago
Spengler, Joseph J.
Population and Amercia's future.
San francisco:
W.H Freeman and company,
1975.
Text.
Gaya MLA
Spengler, Joseph J.
Population and Amercia's future.
San francisco:
W.H Freeman and company,
1975.
Text.
Gaya Turabian
Spengler, Joseph J.
Population and Amercia's future.
San francisco:
W.H Freeman and company,
1975.
Print.