Pennsylvania State Forest School. The Mont Alto seedling. Penn State Forest School].
Chicago-referens (17:e uppl.)Pennsylvania State Forest School. The Mont Alto Seedling. [Mont Alto, Pa.: Penn State Forest School].
MLA-referens (8:e uppl.)Pennsylvania State Forest School. The Mont Alto Seedling. Penn State Forest School].
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.