APA (7e ed.) Bronvermelding

Jackie Gaff. (2005). I Wonder Why Pine Trees Have Needles: And Other Questions About Forests. Gardners Books.

Chicago (17e ed.) Bronvermelding

Jackie Gaff. I Wonder Why Pine Trees Have Needles: And Other Questions About Forests. Gardners Books, 2005.

MLA (9e ed.) Bronvermelding

Jackie Gaff. I Wonder Why Pine Trees Have Needles: And Other Questions About Forests. Gardners Books, 2005.

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