Não informado. (1969). Bulletin of the American Astronomical Society. American Institute of Physics.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the American Astronomical Society. New York: American Institute of Physics, 1969.
MLA-referens (8:e uppl.)Não informado. Bulletin of the American Astronomical Society. American Institute of Physics, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.