Gallwey, W. T. The inner game of tennis (5a ed.).
Cita Chicago (17th ed.)Gallwey, W. Timothy. The Inner Game of Tennis. 5a ed.
Cita MLA (8th ed.)Gallwey, W. Timothy. The Inner Game of Tennis. 5a ed.
Atenció: Aquestes cites poden no estar 100% correctes.