Spence, M., & Lewis, M. A. (2009). Health and growth. World Bank.
Cita Chicago (17th ed.)Spence, Michael, i Maureen A. Lewis. Health and Growth. Washington, D.C: World Bank, 2009.
Cita MLA (9th ed.)Spence, Michael, i Maureen A. Lewis. Health and Growth. World Bank, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.