Perspectiva pes picturae, das ist, Kurtze und leichte Verfassung der practicabelsten Regul, zur perspectivischen Zeichnüngs-Künst ... (1719)
Schübler, Johann Jacob, 1689-1742 · Nürnberg : In Verlag Johann Christoph Weigels, kunsthändlers · leaf 95
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Perspective -- Early works to 1800 · Architectural drawing -- Early works to 1800 · Engraving -- Printing -- Specimens · Perspective -- Ouvrages avant 1800 · Architectural drawing · Engraving -- Printing · Perspective
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.