Cita APA (7a ed.)

Rufus, W. C. (1916). The spectra of stars belonging to class r of the draper classification. Ann Arbor.

Cita Chicago Style (17a ed.)

Rufus, W. Carl. The Spectra of Stars Belonging to Class R of the Draper Classification. Michigan: Ann Arbor, 1916.

Cita MLA (9a ed.)

Rufus, W. Carl. The Spectra of Stars Belonging to Class R of the Draper Classification. Ann Arbor, 1916.