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El Niño's Extended Family: An Introduction to the Cyclic Patterns that Determine Global Weather - NASA Earth Observatory

Earth Changes Gallery: Climate Oscillations - Michael Wells Mandeville

The physical evidence of earth's unstoppable 1,500-year climate cycle  - National Center for Policy Analysis

5.2 Internal climate variability  - Catholic University of Louvain

Understanding global climate patterns - USA Today, April 19, 2006

Natural Climate Oscillations of Short Duration and the Long Term Climate Warming - Sorting Out the Climate System - USGCRP, March 20, 2000

Oceanic and Atmospheric Climate Data - Climate Prediction Center, NOAA

Global Climate Change: Vital Signs of the Planet - NASA Climate Website