Gaya APA
W.Canter, L., G.Hill, L. (1979).
Handbook of variables for environmental impact assessment .
Ann Arbor:
Ann Arbor Science.
Gaya MLA
W.Canter, Larry., G.Hill, Loren.
"Handbook of variables for environmental impact assessment".
Ann Arbor:
Ann Arbor Science,
1979.
Text.