Cita APA

Breger, M., & Jefferys, W. (1977). Student study guide: Astronomy y fundamentals and frontiers. New York: John Wiley.

Citación estilo Chicago

Breger, Michel, and Willam Jefferys. Student Study Guide: Astronomy Y Fundamentals and Frontiers. New York: John Wiley, 1977.

Cita MLA

Breger, Michel, and Willam Jefferys. Student Study Guide: Astronomy Y Fundamentals and Frontiers. New York: John Wiley, 1977.