APA (7th ed.) Citation

Wallenquist, Å. (1929). A photometric research on two open clusters in Cassiopeia (Messier 52 and N. G. C. 663). Almqvist & Wiksell.

Chicago Style (17th ed.) Citation

Wallenquist, Åke. A Photometric Research on Two Open Clusters in Cassiopeia (Messier 52 and N. G. C. 663). Stockholm: Almqvist & Wiksell, 1929.

MLA (9th ed.) Citation

Wallenquist, Åke. A Photometric Research on Two Open Clusters in Cassiopeia (Messier 52 and N. G. C. 663). Almqvist & Wiksell, 1929.