Lundmark, K. E. (1920). The relations of the globular clusters and spiral nebulæ to the stellar system: An attempt to estimate their parallaxes. Almqvist & Wiksells boktryckeri-a.-b..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLundmark, Knut Emil. The Relations of the Globular Clusters and Spiral Nebulæ to the Stellar System: An Attempt to Estimate Their Parallaxes. Stockholm: Almqvist & Wiksells boktryckeri-a.-b., 1920.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLundmark, Knut Emil. The Relations of the Globular Clusters and Spiral Nebulæ to the Stellar System: An Attempt to Estimate Their Parallaxes. Almqvist & Wiksells boktryckeri-a.-b., 1920.
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