Many ideas and pictures came form the book‘Golf Doctor’ (1979), by John Jacobs and Dick Aultman, ilustrated by A. Ravielli.

They are concpts and pictures from two book by Jack Nickaus and Ken Bowden: ‘Golf My Way’ (1982) and ‘Jack Nickaus Playing Lessons’ (1991), both ilustrated by Jim McQueen.

Some ideas, suggestions and images came from Gary Wiren and Dawson Taylor: ‘Super-Power Golf (1984) y ‘Sure Shot’ (1987), and Gary Wiren and Richard Coop: ‘The new golf mind’ (1985)

Other references are:

• ‘Five lessons. The modern fundamentals of golf’ (1957) written by Ben Hogan with pictures from A. Ravielli
• ‘The inner game of golf’ (1979), W. Timothy Gallwey
• ‘Little red golf book’ (1992), Harvey Penick
• ‘The Encyclopedia of Golf’ (1994), Malcolm Campbell.
• ‘Extraordinary golf’ (1996), Fred y Pete Shoemaker
• ‘El lenguaje del golf’ (2002), Álvaro Campos, ilustrated by Antonio Izquierdo.

Some detailed drawigns come from the nice web Golf Distillery, https://www.golfdistillery.com

Some photographs come from my albums and others come from the image bases of Unplash and Pixabay.