1.
- Publishers' international directory with ISBN index. 1, Afghanistan-Uruguay / edit. Helmut Opitz, Karl Heinz Strasser. - 15th ed. - München : Saur, 1988 - xix, 904 s.(Handbook of international documentation and information; vol. 7) ISBN 3-597-20537-6 [1, currently available 1]
- Chapters, articles