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May 29, 2008.
http://www.doi.gov/parkpass.html - Dillon, Constantine. "A National Park for Everyone." The Singing Sands. Vol. 28, no. 2. June 2008-August 2008.
- Green Living Online "India Plans Special Ranger Force
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http://www.greenlivingonline.com/OurWorld/cp-5170/ - Kobasa, Paul A. "National Park System (US)." World Book Encyclopedia 2007 edition. Vol. 14. Chicago: World Book, Inc, 2007.
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http://www.chicagotribune.com/travel/chi-080118-indianadunes_birds-story,0,5515801.story - National Park Service. "Around the World: North Africa
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http://www.nps.gov/oia/around/middleeast.htm - National Park Service. "NPS International Site." May
27, 2008.
http://www.nps.gov/oia/around/asia.htm - Ruskin, William R. "Camping." World Book Encyclopedia 2007 edition. Vol. 3. Chicago: World Book, Inc, 2007.
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http://library.thinkquest.org/16645/national_parks/national_parks.shtml - Vincent-Barwood, Aileen. "A Park for Asir." Saudi Aramco
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