- Krislov , Joseph and Christian , Virgil L. Jr. 1969 . “Union Organizing and The Business Cycle, 1949–1966” . Southern Economic Journal , XXVI October : 185 – 189 .
- United States Department of Labor, Bureau of Labor Statistics . April 1966 . Directory of National and International Labor Unions in the United States, 1965 , Bulletin No. 1493 April , 55
- Steiber , Jack . 1967 . “Collective Bargaining in the Public Sector” . In Challenges to Collective Bargaining Edited by: the American Assembly . 69 – 73 . Englewood Cliffs, New Jersey
- United States Department of Labor . April 1967 . Manpower Report of the President April ,
- Barkin , Solomon . 1961 . The Decline of the Labor Movement , : 10 – 11 .
- United States Department of Commerce . 1960 . Historical Statistics of the United States: Colonial Times to 1957 . : 98
- Troy , Leo . 1965 . Trade Union Membership 1897–1962. 1 New York
Labor History
Volume 11, 1970 - Issue 2