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http://www.skyhawk.org/

http://www.warbirdalley.com/a4.htm

http://www.fas.org/programs/ssp/man/uswpns/air/attack/a4.html

http://www.skyhawk.org/2e/navy.htm

http://commons.wikimedia.org/wiki/A-4_Skyhawk

http://www.conservapedia.com/A-4_Skyhawk

http://science.howstuffworks.com/douglas-a-4-skyhawk.htm

http://www.aerospaceweb.org/aircraft/attack/a4/

http://www.globalsecurity.org/military/systems/aircraft/a-4-var.htm

http://www.warbirdsite.com/museumskyhawk.html

http://search.barnesandnoble.com/US-Navy-and-Marine-Corps-A-4-Skyhawk-Units-in-the-Vietnam-War/Peter-Mersky/e/9781846031816