Jelaskan Rujukan dari Cheng Ho dalam bahasa melayu

Louis Levathes, When China Ruled the Seas: The Treasure Fleet of the Dragon Throne, 1405-1433, Oxford University Press, 1997, trade paperback, ISBN 0195112075

Gavin Menzies, 1421: The Year the Chinese Discovered the World, Morrow/Avon, 2003, hardcover 576 pages, ISBN 0060537639; knowledgeable experts consider this book, in so far as it relates to the Chinese discovery of America, to lack factual foundation; Review of 1421 by a science editor at the New York Times