Knobel, E. (1972). Identify trees and shrubs by their leaves: A guide to trees and shrubs native to the northeast. Dover.
Citazione stile Chigago Style (17a edizione)Knobel, Edward. Identify Trees and Shrubs by Their Leaves: A Guide to Trees and Shrubs Native to the Northeast. Nueva York: Dover, 1972.
Citatione MLA (9a ed.)Knobel, Edward. Identify Trees and Shrubs by Their Leaves: A Guide to Trees and Shrubs Native to the Northeast. Dover, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.