Oliver Everling: Credit Rating by International Agencies, Dr. Th. Gabler, Wiesbaden 1991, http://www.gabler-verlag.de, bound issue, 349 pages, ISBN 3-409-14205-3.
This book is the first book in German language on the topic of credit rating by international agencies. The work was accepted for doctoral studies as an Inauguraldissertation at the University of Cologne. It is the first dissertation on rating. The book laid the foundation for hundreds of other scientific papers as well as doctoral theses and books.
Oliver Everling: Credit Rating durch internationale Agenturen , Betriebswirtschaftlicher Verlag Dr. Th. Gabler, Wiesbaden 1991, http://www.gabler-verlag.de, gebundene Ausgabe, 349 Seiten, ISBN 3-409-14205-3.
^^^ RATING EVIDENCE GmbH 