65319670
9781087973630
Jacob, Dan is the author of 'Secrets of Mental Toughness & How to Build Self Discipline, 2 In 1 : Positive Mindset Mastery to Stop Procrastination, Laziness, Negative Thinking & Mental Training for Strength, Success & Willpower', published 2021 under ISBN 9781087973630 and ISBN 1087973635.
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