Não informado. (1938). Journal of the South African Forestry Association. South African Forestry Association.
Chicago-referens (17:e uppl.)Não informado. Journal of the South African Forestry Association. Pretoria, Africa do Sul: South African Forestry Association, 1938.
MLA-referens (8:e uppl.)Não informado. Journal of the South African Forestry Association. South African Forestry Association, 1938.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.