Say, J., & Richter, J. (1967). Letters to Mr Malthus: On several subjects of political economy,and on the cause of the stagnation of commerce to which is added a catechism of political economy or familiar conversations. New York: Augustus M.Kelley,pub..

Say, Jean-Baptiste, and John Richter. Letters to Mr Malthus: On Several Subjects of Political Economy,and On the Cause of the Stagnation of Commerce to Which Is Added a Catechism of Political Economy or Familiar Conversations. New York: Augustus M.Kelley,pub., 1967.

Say, Jean-Baptiste, and John Richter. Letters to Mr Malthus: On Several Subjects of Political Economy,and On the Cause of the Stagnation of Commerce to Which Is Added a Catechism of Political Economy or Familiar Conversations. New York: Augustus M.Kelley,pub., 1967.