W. D. Wattles 
The Science of Getting Rich [EPUB ebook] 

This book is pragmatical, not philosophical; a practical manual, not a treatise upon theories. It is intended for the men and women whose most pressing need is for money; who wish to get rich first, and philosophize afterward. It is for those who have, so far, found neither the time, the means, nor the opportunity to go deeply into the study of metaphysics, but who want results and who are willing to take the conclusions of science as a basis for action, without going into all the processes by which those conclusions were reached.
It is expected that the reader will take the fundamental statements upon faith, just as he would take statements concerning a law of electrical action if they were promulgated by a Marconi or an Edison; and, taking the statements upon faith, that he will prove their truth by acting upon them without fear or hesitation. Every man or woman who does this will certainly get rich; for the science herein applied is an exact science, and failure is impossible. For the benefit, however, of those who wish to investigate philosophical theories and so secure a logical basis for faith, I will here cite certain authorities.