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.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (9ú heag.)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.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.