Svenonius, B. (1938). Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects: With special regard to objects photographed at Helwan, by. Published by the Observatory.
Citace podle Chicago (17th ed.)Svenonius, Björn. Contributions to the Photographic Study of Colour, Resolution and Total Magnitude of Anagalactic Objects: With Special Regard to Objects Photographed at Helwan, by. Lund, Sweden: Published by the Observatory, 1938.
Citace podle MLA (8th ed.)Svenonius, Björn. Contributions to the Photographic Study of Colour, Resolution and Total Magnitude of Anagalactic Objects: With Special Regard to Objects Photographed at Helwan, by. Published by the Observatory, 1938.
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