APA citiranje

Shapley, H., & Boyd, C. D. (1940). Galactic and Extragalactic Studies: IV. Photometry of Two Large Southern Clusters of Galaxies.

Citação norma Chicago

Shapley, Harlow, and Constance D. Boyd. Galactic and Extragalactic Studies: IV. Photometry of Two Large Southern Clusters of Galaxies. 1940.

MLA citiranje

Shapley, Harlow, and Constance D. Boyd. Galactic and Extragalactic Studies: IV. Photometry of Two Large Southern Clusters of Galaxies. 1940.