APA-Zitierstil (7. Ausg.)

Shapley, H., Shapley, H., & Shapley, M. B. (1919). Studies based on the colors and magnitudes in stellar clusters. s.t.

Chicago-Zitierstil (17. Ausg.)

Shapley, Harlow, Harlow Shapley, und Martha Betz Shapley. Studies Based on the Colors and Magnitudes in Stellar Clusters. Washington: s.t, 1919.

MLA-Zitierstil (9. Ausg.)

Shapley, Harlow, et al. Studies Based on the Colors and Magnitudes in Stellar Clusters. s.t, 1919.