Elen, A. J. (1989). Missing old master drawings from the Franz Koenigs collection. The Hague: SDU Publ.
Čikaški stil citiranjaElen, Albert J. Missing Old Master Drawings From the Franz Koenigs Collection. The Hague: SDU Publ, 1989.
MLA način citiranjaElen, Albert J. Missing Old Master Drawings From the Franz Koenigs Collection. The Hague: SDU Publ, 1989.
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