His The secret of the universe=Mysterium cosmographicum, 1981 t.p. (Johannes Kepler)
His O shestiugolʹnykh snezhinkakh, 1982 t.p. (I. Kepler) verso t.p. (Iogann Kepler)
InU/Wing STC files (usage: John Kepler)
LCCN 14-22414: Hasner, J. Tycho Brahe und J. Kepler in Prag, 1872 (hdg.: Kepler, Johann, 1571-1630)
Strobel, R. Das Wohnhaus von Johannes Kepler in Regensburg, 2011 page 7 (Johannes Kepler; astronomer and mathematician; lived in Graz, Prague, Linz, and Regensburg, died in Regensburg 1630)