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Methods of studying water relations, Bohdan Slavik, Ecological Studies Band 9, J. Jakob, O. Lange, JS Olson, W. Wieser (Eds.), Springer-Verlag, Berlin-Heidelberg-New York (1974), XIII, 449 S. und 181 Abbildungen. geb. DM 76
Effects of the Union: A Symposium White-Collar Unions, Blue-Collar Unions, and Wages in Manufacturing Daniel S. Hamermesh Union Relative Wage Effects by Age and George E. Johnson Education and Kenwood C. Youmans