Não informado. Observations of Variable Stars. Kapteyn Astronomical Laboratory.
Chicago Style (17th ed.) CitationNão informado. Observations of Variable Stars. Groningen, Holanda: Kapteyn Astronomical Laboratory.
MLA (8th ed.) CitationNão informado. Observations of Variable Stars. Kapteyn Astronomical Laboratory.
Warning: These citations may not always be 100% accurate.