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Author: 
			William Bray			 
				 
			ISBN: 9780763772567 (Hardcover) 
				 
			Publisher: Jones & Bartlett Learning 
				 
			Year: 2012 
			Author: 
			Enrique Vilchez Quesada			 
				 
			ISBN: 9789977662435 (Hardcover) 
				 
			Publisher: Technology of Costa Rica 
				 
			Year: 2012 
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