APA (7th ed.) Citation

Shapley, H. (1923). Light and color variations of Nova Aquilae 1918. 4. [Publication Office: Easton, Pa.].

Chicago Style (17th ed.) Citation

Shapley, Harlow. Light and Color Variations of Nova Aquilae 1918. 4. [Baltimore & Boston]: [Publication Office: Easton, Pa.], 1923.

MLA (9th ed.) Citation

Shapley, Harlow. Light and Color Variations of Nova Aquilae 1918. 4. [Publication Office: Easton, Pa.], 1923.

Warning: These citations may not always be 100% accurate.