Gaya APA
Freeman, M, S. (2011).
Rourke's world of science encyclopedia Vol. 10 : research projects .
Florida:
Rourke Publshing.
Gaya MLA
Freeman, Marcia, S..
"Rourke's world of science encyclopedia Vol. 10 : research projects".
Florida:
Rourke Publshing,
2011.
Text.