Gaya APA
Gregor, Howard F.. (1963).
Environment and economic life : an economic and social geography / Howard F. Gregor .
:
New York : D. Van Nostrand.
Gaya Chicago
Gregor, Howard F..
Environment and economic life : an economic and social geography / Howard F. Gregor.
:
New York : D. Van Nostrand,
1963.
Buku.
Gaya MLA
Gregor, Howard F..
Environment and economic life : an economic and social geography / Howard F. Gregor.
:
New York : D. Van Nostrand,
1963.
Buku.
Gaya Turabian
Gregor, Howard F..
Environment and economic life : an economic and social geography / Howard F. Gregor.
:
New York : D. Van Nostrand,
1963.
Buku.