Turner, Harry
Alphabetical Checklist
- Now & Then Revisited (Romiley, Greater Manchester, England: Farrago Books, 2013)
- The Second Triad Coloring Book (Romiley, Greater Manchester, England: Farrago Books, 2013)
- The Triad Optical Illusions Coloring Book (New York: Dover Publications, 2006)
- Triad Optical Illusions and How To Design Them (New York: Dover Publications, 1978)