Gaya APA
Maceachern, S. (2004).
Student Encyclopedia Volume 6 Economy - Food Chain (6).
cambridge, UK:
GROLIER DANBURY,CONNECTICUT.
Gaya MLA
Maceachern, Sally.
"Student Encyclopedia Volume 6 Economy - Food Chain".
6
cambridge, UK:
GROLIER DANBURY,CONNECTICUT,
2004.
Text.