Cita APA

Gardner, M., & Schroeder, T. (1997). Puzzling questions about the solar system. Dover Publications.

Citación estilo Chicago

Gardner, Martin, y Ted Schroeder. Puzzling Questions About the Solar System. Mineola, N.Y.: Dover Publications, 1997.

Cita MLA

Gardner, Martin, y Ted Schroeder. Puzzling Questions About the Solar System. Dover Publications, 1997.