Não informado. (1972). Forestry digest. University of the Philippines, College of Forestry, Department of Forestry.
Chicago-referens (17:e uppl.)Não informado. Forestry Digest. Laguna, Filipinas: University of the Philippines, College of Forestry, Department of Forestry, 1972.
MLA-referens (8:e uppl.)Não informado. Forestry Digest. University of the Philippines, College of Forestry, Department of Forestry, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.