Cita APA (7th ed.)

Schaaf, F. (1991). Seeing the solar system: Telescopic projects, activities, and explorations in astronomy. Wiley.

Cita Chicago (17th ed.)

Schaaf, Fred. Seeing the Solar System: Telescopic Projects, Activities, and Explorations in Astronomy. New York: Wiley, 1991.

Cita MLA (8th ed.)

Schaaf, Fred. Seeing the Solar System: Telescopic Projects, Activities, and Explorations in Astronomy. Wiley, 1991.