Underrstanding Soccer was used as a textbook at some colleges and universities in the 90s. It has been revised and updated. It is available as a free download. It includes a chapter by Dr. Colleen Hacker on psychological skills. Have a look. I would appreciate your comments. The first link is for the entire book in pdf format, an Advance Prepublication Copy https://drive.google.com/file/d/1HlJpBM4v_nDxceldG92MYAel9wg7xKfl/view?usp=drive_link Here are other sources for the download: Table of contents: https://indd.adobe.com/view/89014719-e3f9-4f6e-89d1-789a918d2eb2 Skills Chapter: https://indd.adobe.com/view/ac70145d-4a1e-48fc-a490-b466fbe33d80 Advanced Dribbling: https://indd.adobe.com/view/27c3b305-3c60-4de7-9675-a17157b7825d Decisions when you have the ball: https://indd.adobe.com/view/39996053-9c82-494a-abb6-c02c4ad61015 Position Play: https://indd.adobe.com/view/fa980e62-7689-43d4-aea3-5aa4df6588e1 Defending at the ball: https://indd.adobe.com/view/8e186a52-421b-4796-a627-fed97fd879a8 Defending off the ball: https://indd.adobe.com/view/223af159-5d69-4151-b678-18b0733bf044 Set Plays: https://indd.adobe.com/view/3c5136ef-8483-469d-a0e4-8ff17cdda1ac Psychological Skills: https://indd.adobe.com/view/9476a3b4-ff30-439d-8c5f-11e7159efb2e Index: https://indd.adobe.com/view/2fdfeb26-c52f-45df-a812-864c995e6e54 Dr. Hacker bio: https://indd.adobe.com/view/aa6d6412-8e16-425d-8b83-863955a53a47