Answer: examples: historical instance, personal story
Data: statistics, verifiable facts
Testimony: expert judgment, eyewitnesses account
Explanation:
The only thing I can find is that Jerome had taken a very similar trip along the Thames for his honeymoon in 1888, and his experiences provided him the subject material for the novel. I don't see, in my copy, an acknowledgement to any particular person.
Positive thinking is an attitude that pushes you to expect good and desired results. Power of positivity helps you in creating and transforming energy into reality. Positive mindset helps you to seek happiness, health and a happy ending regardless of the situation. Lots of successful people have recognized the positivity as the key to success.