Gaya APA
Canter, L, W., Hill, L, G. (1979).
Handbook of Variables for Enviromental Impact Assessment .
Ann Arbor:
Ann Arbor Science.
Gaya MLA
Canter, Larry, W., Hill, Loren, G.
"Handbook of Variables for Enviromental Impact Assessment".
Ann Arbor:
Ann Arbor Science,
1979.
Text.