Cita APA (7a ed.)

Carl Sagan. (1970). Planetary exploration. Oregon State System of Higher Education.

Cita Chicago Style (17a ed.)

Carl Sagan. Planetary Exploration. Eugene, Oregon: Oregon State System of Higher Education, 1970.

Cita MLA (9a ed.)

Carl Sagan. Planetary Exploration. Oregon State System of Higher Education, 1970.