Não informado. Trees and life. Men of the Trees Society.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Trees and Life. London: Men of the Trees Society.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Trees and Life. Men of the Trees Society.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.