Cita APA (7th ed.)
Malthus, T. R. (2001). An Essay on the principle of population. Electric Book Co..
Cita Chicago (17th ed.)
Malthus, T. R. An Essay on the Principle of Population. London: Electric Book Co., 2001.
Cita MLA (9th ed.)
Malthus, T. R. An Essay on the Principle of Population. Electric Book Co., 2001.
Atenció: Aquestes cites poden no estar 100% correctes.