I don’t have a book to suggest, but I would say becoming a keen observer might help. Try to pinpoint what you admire or are drawn to in the people you want to emulate. Maybe start with their clothes, posture, facial expression, tone on their voice. I would say exuding confidence is the biggest thing. Standing tall, speaking clearly, looking people in the eye, wearing clothes that are new or still appear new, being kind to other in the room, including them.