Não informado. (2012). Arboriculture & Urban Forestry. International Society of Arboriculture.
Chicago-referens (17:e uppl.)Não informado. Arboriculture & Urban Forestry. Champaign, Ill: International Society of Arboriculture, 2012.
MLA-referens (8:e uppl.)Não informado. Arboriculture & Urban Forestry. International Society of Arboriculture, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.