Adam Smith- The Wealth of Nations- http://www.gutenberg.org/files/3300/3300-h/3300-h.htm
J.M Keynes- The Consequences of Peace- http://www.gutenberg.org/files/15776/15776-8.txt
Karl Marx- The Communist Manifesto- http://www.gutenberg.org/files/61/61.txt
Malthus- Principles of Population- http://www.gutenberg.org/files/4239/4239-h/4239-h.htm- The Nature and Progress of Wealth- http://www.gutenberg.org/files/4336/4336-h/4336-h.htm
