Não informado. (1969). AAS photo-bulletin. American Astronomical Society, Working Group on Photographic Materials.
Chicago-viite (17. p.)Não informado. AAS Photo-bulletin. Rochester, NY: American Astronomical Society, Working Group on Photographic Materials, 1969.
MLA-viite (8. p.)Não informado. AAS Photo-bulletin. American Astronomical Society, Working Group on Photographic Materials, 1969.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.