All classes productive of national wealth, or, The theories of M. Quesnai, Dr. Adam Smith, and Mr. Gray concerning the various classes of men, as to the production of wealth to the community - Gray, Simon (Printed for Longman, Hurst, Rees, Orme, and Brown, 1817)
Goldsmiths'-Kress no. 21714. - Includes bibliographical references and index. - OCLC, 17020056. - Reproduction of original from Kress Library of Business and Economics, Harvard University