His first book , The Nature of the ORGANIZATION@1 -LRB- NUMBER@1 -RRB- , is considered influential even to this day , as is his introductory textbook , ORGANIZATION@2 -LRB- NUMBER@2 -RRB- .

His first book , The Nature of the ORGANIZATION@1 -LRB- NUMBER@1 -RRB- , is still used today .
