Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Furness, Caroline E. An Introduction to the Study of Variable Stars. Boston: Hougton Mifflin, 1915.

Cita MLA (9a ed.)

Furness, Caroline E. An Introduction to the Study of Variable Stars. Hougton Mifflin, 1915.