//-->
The general social survey, 1972 - 1986 : the state of the American people
Russell, Charles H., (1988)
Measuring public opinion on national prioroties. A report on a pilot study
Beardsley, Philip Lane, (1974)
Pollsters report on American consumers and businessmen : hearing before the Joint Economic Committee, Congress of the United States, Ninety-fourth Congress, October 30, 1975
(1975)