"Madeira." The American Heritage® Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. Answers.com 03 Nov. 2011. http://www.answers.com/topic/madeira
"Madeira." The Columbia Electronic Encyclopedia, Sixth Edition. Columbia University Press. , 2011. Answers.com 03 Nov. 2011. http://www.answers.com/topic/madeira
"Madeira." The Oxford Essential Geographical Dictionary. Oxford University Press, 2006. Answers.com 03 Nov. 2011. http://www.answers.com/topic/madeira
"Madeira." The Oxford Essential Geographical Dictionary. Oxford University Press, 2006. Answers.com 03 Nov. 2011. http://www.answers.com/topic/madeira