National Research Council (U.S.). Transportation Research Board. (1981). Research problem statements in landscape and environmental design. The Board.
Chicago-Zitierstil (17. Ausg.)National Research Council (U.S.). Transportation Research Board. Research Problem Statements in Landscape and Environmental Design. Washington, D.C: The Board, 1981.
MLA-Zitierstil (9. Ausg.)National Research Council (U.S.). Transportation Research Board. Research Problem Statements in Landscape and Environmental Design. The Board, 1981.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.