APA (7e ed.) Bronvermelding

Kathleen Weidner Zoehfeld. (2012). National Geographic Readers: Rocks and Minerals (39197th.). National Geographic Children's Books.

Chicago (17e ed.) Bronvermelding

Kathleen Weidner Zoehfeld. National Geographic Readers: Rocks and Minerals. 39197th. National Geographic Children's Books, 2012.

MLA (9e ed.) Bronvermelding

Kathleen Weidner Zoehfeld. National Geographic Readers: Rocks and Minerals. 39197th. National Geographic Children's Books, 2012.

Let op: Deze citaties zijn niet altijd 100% accuraat.