The best resource I have found is a fantastic old book - Straight and Crooked Thinking[1] [1] http://www.neglectedbooks.com/Straight_and_Crooked_Thinking.pdf h

The best resource I have found is a fantastic old book - Straight and Crooked Thinking[1] [1] http://www.neglectedbooks.com/Straight_and_Crooked_Thinking.pdf http://www.neglectedbooks.com/Straight_and_Crooked_Thinking....