Calyton, E. (1983). Agriculture, poverty, and freedom in developing countries. Macmillan.
Lua i Stíl Chicago (17ú heag.)Calyton, Eric. Agriculture, Poverty, and Freedom in Developing Countries. London: Macmillan, 1983.
Lua MLA (9ú heag.)Calyton, Eric. Agriculture, Poverty, and Freedom in Developing Countries. Macmillan, 1983.