Ungar, A. (1967). Traffic attraction of rural outdoor recreational areas. Highway Research Board, Division of Engineering, National Research Council, National Academy of Sciences--National Academy of Engineering.
Chicago-viite (17. p.)Ungar, Andrew. Traffic Attraction of Rural Outdoor Recreational Areas. [Washington]: Highway Research Board, Division of Engineering, National Research Council, National Academy of Sciences--National Academy of Engineering, 1967.
MLA-viite (9. p.)Ungar, Andrew. Traffic Attraction of Rural Outdoor Recreational Areas. Highway Research Board, Division of Engineering, National Research Council, National Academy of Sciences--National Academy of Engineering, 1967.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.