WDB	Fabrica Et Vsvs Instrvmenti Ad Horologiorvm Descriptionem Peropportvni : Accessit Ratio Describendarvm horarum a meridie & media nocte exquisitissima, & nunquam ante hac in lucem edita / Clavius, Christoph *1537-1612*. - Electronic ed.. - Romae : Grassius, 1586 Permalink: http://diglib.hab.de/drucke/n-102-4f-helmst-3/start.htm					Deutsch
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