1.		The travel market 1955 : A report to the Travel research Association / John B. Lansing, Ernest Lilienstein Autor: Lansing, John B. Data Publicação: 1955 Coautor: Lilienstein, Ernest COTA(S): 599
2.		The travel market 1958 : A report on the vacation travel, travel patterns and attitudes of American families / John B. Lansing Autor: Lansing, John B. Data Publicação: 1958 COTA(S): 610