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Benzing, J. Die Buchdrucker des 16. und 17. Jahrhunderts in deutschen Sprachgebiet, 1963: p. 36 (Johann Oporinus, fl. 1536-1567)
OCLC, 4-11-95 (hdg.: Oporin, Johann, 16th century, Oporinus, Joannes, 1507-1568; usage: Ioannis Oporini, Ioannem Oporinum, Ioannes Oporinus, J. Oporinum, Oporinum, J. Oporinus, I. Oporini, J.H. Oporinus, Iohannis Oporini, Joannes Oporinus, Ioannem Oporinvm)