Here is a cover picture of the 1978 edition of the book Wing Tsun Kuen by Leung Ting, 10th Level M.O.C., Grandmaster of WingTsun. This is the book that got me and thousands of others around the world interested in his system!
Grandmaster Leung Ting was the first person to use the spelling Wing Tsun in preference to Wing Chun to describe his system. His system, Wing Tsun, has unique functional and technical features that others do not. He has claimed trademark protection on the words WingTsun™ and Wing Tsun™ and registered the words Leung Ting WingTsun® with the United States Patent and Trademark Office.
– Sifu Keith Sonnenberg