@booklet {7290, title = {The Social System: A Treatise on the Principle of Exchange}, year = {1831}, note = {
Rpt. New York: Augustus M. Kelley, 1973.
}, month = {1831}, publisher = {William Tait}, address = {Edinburgh, Scot.}, abstract = {Includes part of a chapter (30-39) detailing a new economic system.
}, keywords = {Male author}, author = {John Gray (1799-1833)} }