Cita APA

Shapley, H. (1940). Galactic and Extragalactic Studies: XI. Note on the Period-Frequency of Galactic Cepheids.

Chicago Style Citation

Shapley, Harlow. Galactic and Extragalactic Studies: XI. Note On the Period-Frequency of Galactic Cepheids. 1940.

Cita MLA

Shapley, Harlow. Galactic and Extragalactic Studies: XI. Note On the Period-Frequency of Galactic Cepheids. 1940.

Atenció: Aquestes cites poden no estar 100% correctes.