Schmidt, S J. (2008). Systemflirts. Weilerswist: Velbrück.
ISBD CitationSystemflirts / Siegfried J. Schmidt . — Weilerswist : Velbrück, 2008. — 229 S. — ISBN 978-3-938808-41-2
MLA CitationSchmidt, Siegfried J. Systemflirts.Weilerswist: Velbrück, 2008.
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