Tohutoro APA (7th ed.)
Ahrens, F., & Walter, H. R. (1971). Datenbanksysteme. |Walter de Gruyter.
Tohutoru Kātū Chicago (17th ed.)
Ahrens, Friedhelm, me Helmut R. Walter. Datenbanksysteme. Berlin ; New York: |Walter de Gruyter, 1971.
Tohutoro MLA (9th ed.)
Ahrens, Friedhelm, me Helmut R. Walter. Datenbanksysteme. |Walter de Gruyter, 1971.
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