1. Transportation Facts and Trends;Transportation Association of America,1970
2. Urban Transportation Planning—Introduction to Methodology;Davis,1968
3. Melvin Kranzberg, “The Social Impact of Transportation Technology: Some Lessons of History” in Essays on Transportation Problems in the 1970s (George Smerk, Ed.), Bureau of Business Research, Indiana University, Bloomington, Ind., 4–35.
4. The Coming Revolution in Transportation;Appel;National Geographic,1969
5. Profiles of the Future;Clarke,1963