Gaya APA
Abela, D. (2006).
Spy Force: In Search of the Time and Space Machine .
United States of America:
Aladdin Paperbacks.
Gaya MLA
Abela, Deborah.
"Spy Force: In Search of the Time and Space Machine".
United States of America:
Aladdin Paperbacks,
2006.
Buku.