Article Dupré, Sven (2003)
The Dioptrics of Refractive Dials in the Sixteenth Century. Nuncius: Annali di Storia della Scienza (p. 39). (/isis/citation/CBB000340715/) unapi

Book Hartmann, Georg (2002)
Hartmann's “Practika”: A Manual for Making Sundials and Astrolabes with the Compass and Rule. (/isis/citation/CBB000301754/) unapi

Article Lamprey, John P. (1997)
An examination of two groups of Georg Hartmann 16th-century astrolabes and the tables used in their manufacture. Annals of Science: The History of Science and Technology (pp. 111-142). (/isis/citation/CBB000074033/) unapi

Book Klemm, Hans Gunther (1990)
Georg Hartmann aus Eggolsheim (1489-1564): Leben und Werk eines fränkischen Mathematikers und Ingenieurs. (/isis/citation/CBB000041618/) unapi