APA-ийн эшлэл(7 дахь хэвлэлт)

Lewis, W. W. (2004). The power of productivity: Wealth, poverty, and the threat to global stability. University of Chicago Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Lewis, William W. The Power of Productivity: Wealth, Poverty, and the Threat to Global Stability. Chicago: University of Chicago Press, 2004.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Lewis, William W. The Power of Productivity: Wealth, Poverty, and the Threat to Global Stability. University of Chicago Press, 2004.