Joe Kemmerer, a student of Bill Shank, recently published a book titled
"The Invisible Square Ring" that deals with basic and intermediate sparring.
The book can be ordered from www.authorhouse.com/bookstore or call toll free 888.280.7715.
The book will soon be carried by Amazon.com. Cost of the book is $23.95 plus S/H. There is an ad on page 142 in the October edition of 'Black Belt' magazine.