"भंवर गैलेक्सी": अवतरणों में अंतर
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पंक्ति 7:
| first=J. L. E. |last=Dreyer |editor-first=R. W. |editor-last=Sinnott
| title=The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters
| url=https://archive.org/details/ngc20000complete0000drey | date=1988
| publisher=Sky Publishing Corporation/Cambridge University Press
| isbn=0-933346-51-4
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