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Untersuchungen über das Versicherungswesen in Deutschland
(1913)
Grundzüge des Versicherungswesens
Manes, Alfred, (1918)
A two-stage model of the demand for specialty crop insurance
Richards, Timothy J., (2000)
Employment, unemployment and underemployment : an analysis
Ray, P. K., (1998)
Decent work in the informal sector : training issues
Ray, P. K., (2002)
Crop insurance and the problems of its application to underdeveloped countries
Ray, P. K., (1955)