Gaya APA
Duffield, B.S.. (1976).
A method for estimating recreational trffic flows .
:
TRRL.
Gaya Chicago
Duffield, B.S..
A method for estimating recreational trffic flows.
:
TRRL,
1976.
Chart.
Gaya MLA
Duffield, B.S..
A method for estimating recreational trffic flows.
:
TRRL,
1976.
Chart.
Gaya Turabian
Duffield, B.S..
A method for estimating recreational trffic flows.
:
TRRL,
1976.
Chart.