Work scale / middle cover 21*14

He started writing "The Standard of Knowledge" which explains the rules of logic, judgment, types of mind and thinking, and others. The writing of The Standard of Knowledge is complemented by the book "The Objectives of Philosophers," which explains the ideas of philosophers, then the writing of "The Collapse of Philosophers," which he responded to them with. Then the other part is the work in this book "The Balance of Work," how to correct work and what is the standard of its correctness or incorrectness. The edition: the measure: 21*14 number of pages: storage number:.