Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.