Say, J. B., & 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 on the manner in which wealth is produced, distributed and consumed in society. New York: Augustus M. Kelley.

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 On the Manner in Which Wealth Is Produced, Distributed and Consumed in Society. New York: Augustus M. Kelley, 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 On the Manner in Which Wealth Is Produced, Distributed and Consumed in Society. New York: Augustus M. Kelley, 1967.