Flesch Rudolf. The Art of Clear Thinking

New York: Harpers & Brothers Publishers, 1951. — 212 p.The book discusses thinking and problem-solving drawing on psychology, linguistics, anthropology, neurology, sociology and other sciences.
A practical self-help book for all who want to improve their thinking and increase their flow of ideas.
"We could improve our personal finances by budgeting, but we don't budget; we could improve our health by dieting, but we don't diet; we could improve our careers by studying, but we don't study. Information is piled high in our lives' archives but we don't use it. Thinking is too hard but it is too awesome as well."