Gaya APA
Freeman, M, E. (2011).
Rourke's World of Science Encyclopedia Volume 7: Astronomy and Space .
Florida:
Rourke Publishing.
Gaya MLA
Freeman, Marcia, Et.al.
"Rourke's World of Science Encyclopedia Volume 7: Astronomy and Space".
Florida:
Rourke Publishing,
2011.
Buku Tercetak.