Tourist Guide Madrid. "Famous Madrid Tourist Attractions." Essential Madrid Tourist Guide: Tourist Information And Tourism Guide. Tourist Guide Madrid. Web. 17 Mar. 2011. <http://www.madrid-tourist-guide.com/en/attractions/madrid-tourist-attractions.html>.
PlanetWare Inc. "Top Rated Tourist Attractions in Madrid." PlanetWare Travel Guide - Hotels, Attractions, Pictures, Maps & More. PlanetWare Inc. Web. 17 Mar. 2011. <http://www.planetware.com/top-tourist-attractions-/madrid-e-mad-mad.htm>.
New World Treasures. "Atocha Emeralds, Authenitc Atocha Shipwreck Emerald Artifact." Spanish Colonial Coins, Atocha Shipwreck Coins, and Ancient Coin Jewelry. New World Treasures. Web. 17 Mar. 2011.
New World Treasures. "8 Escudos Coins, Spanish Gold Doubloon." Spanish Colonial Coins, Atocha Shipwreck Coins, and Ancient Coin Jewelry. New World Treasures. Web. 17 Mar. 2011. <http://www.newworldtreasures.com/gold-8-escudos.htm>.
New World Treasures. "Authentic Crusader Coin Jewelry, Silver Denaro Coins from Genoa Italy ." Spanish Colonial Coins, Atocha Shipwreck Coins, and Ancient Coin Jewelry. New World Treasures. Web. 17 Mar. 2011.
New World Treasures. "Spanish Cannon, Spanish Bronze Cannon Patterned from Those Recovered from the Atocha Shipwreck." Spanish Colonial Coins, Atocha Shipwreck Coins, and Ancient Coin Jewelry. New World Treasures. Web. 17 Mar. 2011. <http://www.newworldtreasures.com/atocha-cannon.htm>.