TA today: a new introduction to transactional analysis / by Ian Stewart and Vann Joines

When you have read this book through and completed the exercises, you will certainly know a lot more about yourself than you did when you started. You may also find you can use this knowledge to make some changes in your life which you had been wanting to make. If so, congratulations.
But this book is not intended as a substitute for therapy or counselling. If you have substantial personal problems, you are advised to seek out a reputable therapist or counsellor who can give you the expert personal attention you need. TA practitioners encourage their clients to learn the ideas of TA. If you decide to enter TA therapy or counselling, or wish to apply TA to your work in education or organizations, you can use this book as a source of that learning. If your wish is to provide TA therapy or services to others, this book will likewise be useful to you as your first introduction to the basic ideas of TA. Indeed, the book's coverage of TA theory is comprehensive enough to provide you with a solid reference base for use in accredited TA training, up to and including the level of Certified Transactional Analyst. But reading alone does not qualify you to offer professional help.