|url=https://books.google.com/books?id=P0VpUOh9S3oC&printsec=frontcover&dq=Hedtke+the+secrets&hl=en&sa=X&ei=tLqwUdqkI8GD4AT8vIGYCA&redir_esc=y#v=onepage&q=analogy%20substitued&f=false | |url=https://books.google.com/books?id=P0VpUOh9S3oC&printsec=frontcover&dq=Hedtke+the+secrets&hl=en&sa=X&ei=tLqwUdqkI8GD4AT8vIGYCA&redir_esc=y#v=onepage&q=analogy%20substitued&f=false |