Cita APA (7th ed.)

OBERG, J. E., & OBERG, A. R. (1986). Pioneering space: Living on the next frontier. McGraw-hill.

Cita Chicago (17th ed.)

OBERG, James E., i Alcestis R. OBERG. Pioneering Space: Living on the Next Frontier. New York: McGraw-hill, 1986.

Cita MLA (9th ed.)

OBERG, James E., i Alcestis R. OBERG. Pioneering Space: Living on the Next Frontier. McGraw-hill, 1986.