Cita APA (7a ed.)

Furness, C. E. (1915). An introduction to the study of variable stars. Houghton Mifflin Company.

Cita Chicago Style (17a ed.)

Furness, Caroline Ellen. An Introduction to the Study of Variable Stars. Boston : New York: Houghton Mifflin Company, 1915.

Cita MLA (9a ed.)

Furness, Caroline Ellen. An Introduction to the Study of Variable Stars. Houghton Mifflin Company, 1915.