Gaya APA
Darling, D. (2003).
The complete book of spaceflight: from appolo 1 to zero gravity .
Norwood, New Jersey:
John Wiley n Sons.
Gaya MLA
Darling, David.
"The complete book of spaceflight: from appolo 1 to zero gravity".
Norwood, New Jersey:
John Wiley n Sons,
2003.
Skripsi.