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This book is awesome. Everyone must read this book once even those people who do not have any problems in saying "no" because it clearly mentions the right time to say "no" or "yes" with grace and earning respect from the requestor as well. Adopting those habits mentioned in this books helps us to determine whom we should help really and whom or circumstances in which we should not.
The Art of Saying No: How to Stand Your Ground, Reclaim Your Time and Energy, and Refuse to be Taken for Granted (without Feeling Guilty!)