Gaya APA
Petersen, Christine. (2004).
Conservation : Christine Petersen .
USA:
Childrens Press.
Gaya Chicago
Petersen, Christine.
Conservation : Christine Petersen.
USA:
Childrens Press,
2004.
English Corner.
Gaya MLA
Petersen, Christine.
Conservation : Christine Petersen.
USA:
Childrens Press,
2004.
English Corner.
Gaya Turabian
Petersen, Christine.
Conservation : Christine Petersen.
USA:
Childrens Press,
2004.
English Corner.