Gaya APA

OBERG, J, E., Oberg, A, R. (1986). Pioneering Space . New York: McGraw-HILL BOOK COMPANY INC.

Gaya MLA

OBERG, James, E., Oberg, Alcestis, R. "Pioneering Space". New York: McGraw-HILL BOOK COMPANY INC, 1986. Text.