Não informado. (2001). Bulletin of the Astronomical Institutes of Czeschoslovakia. Astronomical Institutes of Czeschoslovakia.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Astronomical Institutes of Czeschoslovakia. Prague: Astronomical Institutes of Czeschoslovakia, 2001.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Astronomical Institutes of Czeschoslovakia. Astronomical Institutes of Czeschoslovakia, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.