Knobel, E. (1972). Identify trees and shrubs by their leaves: A guide to trees and shrubs native to the northeast. Dover.
Chicago-Zitierstil (17. Ausg.)Knobel, Edward. Identify Trees and Shrubs by Their Leaves: A Guide to Trees and Shrubs Native to the Northeast. Nueva York: Dover, 1972.
MLA-Zitierstil (9. Ausg.)Knobel, Edward. Identify Trees and Shrubs by Their Leaves: A Guide to Trees and Shrubs Native to the Northeast. Dover, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.