Gaya APA
Challand, Helen J.. (1983).
Volcanoes .
Chicago:
Childrens Press.
Gaya Chicago
Challand, Helen J..
Volcanoes.
Chicago:
Childrens Press,
1983.
Text.
Gaya MLA
Challand, Helen J..
Volcanoes.
Chicago:
Childrens Press,
1983.
Text.
Gaya Turabian
Challand, Helen J..
Volcanoes.
Chicago:
Childrens Press,
1983.
Print.