アストロノミシェ・ナハリヒテン
↑ Benjamin Apthorp Gould and the founding of the Astronomical Journal, Owen Gingerich, The Astronomical Journal, 117:1-5, 1999 January. "Gould had decided to use his own funds to help start a new journal, to be modeled explicitly on the prestigious German Astronomische Nachrichten, then in its 28th volume."
↑ Karl Nikolaus Adalbert Krueger, biography from Tuorla Observatory, Finland.
↑ Heinrich Carl Friedrich Kreutz - biography from Students for the Exploration and Development of Space (SEDS).
↑ German Astronomy in the Third Reich by Hilmar W. Duerbeck - book chapter published in Organisations and Strategies in Astronomy Volume 7 (2006).