"Nature and Landscape Photography", from ''Visualizing Nature: Promoting Public Understanding and Appreciation of Nature, [Department of] Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana, retrieved October 4, 2015. نسخة محفوظة 20 مارس 2016 على موقع واي باك مشين.
"Nature and Landscape Photography", from ''Visualizing Nature: Promoting Public Understanding and Appreciation of Nature, [Department of] Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana, retrieved October 4, 2015. نسخة محفوظة 20 مارس 2016 على موقع واي باك مشين.