APA (7th ed.) Citation

Comstock, G. C. (1890). Observations of double stars. Democrat Print. Comp.

Chicago Style (17th ed.) Citation

Comstock, George Cary. Observations of Double Stars. Madison, Wis: Democrat Print. Comp, 1890.

MLA (9th ed.) Citation

Comstock, George Cary. Observations of Double Stars. Democrat Print. Comp, 1890.