The classic source on the power of the subconscious mind is Psychocybernetics by Maxwell Maltz. The Amazon.com link is below:
For American Dollars:
https://www.amazon.com/PsychoCybernetics-M-D-F-I-C-S-Maxwell-Maltz/dp/B000Q6Q26E
For Canadian Dollars
https://www.amazon.ca/Psycho-Cybernetics-Maxwell-Maltz/dp/0671700758/ref=sr_1_1?ie=UTF8&s=books&qid=1244586021&sr=8-1