You're looking for information on the book "Sentirse Bien" by David Burns, and you'd like to know more about the PDF version. Here's what I found:

Sentirse Bien " (Feeling Good) by Dr. David D. Burns is a foundational work in Cognitive Behavioral Therapy (CBT) that focuses on identifying and refuting negative thought patterns to improve emotional well-being Core Concept: The CBT Formula

Picking out a single negative detail and dwelling on it exclusively. Disqualifying the Positive:

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Burns’ signature worksheet invites the reader to a distressing thought, identify the distortion, and replace it with a more balanced alternative. Here’s a quick example in Spanish: