Gaya APA

Obeng, J, E. (1986). Pioneering Space: Living On The Next Frontier . New York: MCGRAW-HILL BOOK COMPANY, INC..

Gaya MLA

Obeng, James, E.. "Pioneering Space: Living On The Next Frontier". New York: MCGRAW-HILL BOOK COMPANY, INC., 1986. UMUM.