(美)Robert E. Walters[等]著 (美)Robert E. Maples著 (美)Robert F. Weaver著 (美)Robert E. Rakel原著 (美)Robert C. Martin著 (美)Robert A. Davis著 (美)Robert A. Pease著 (美)Robert A. Meyers主编 (美)Robert B. Northrop著 (美)Robert G. Gallager著