Não informado. (1938). Journal of the South African Forestry Association. South African Forestry Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of the South African Forestry Association. Pretoria, Africa do Sul: South African Forestry Association, 1938.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of the South African Forestry Association. South African Forestry Association, 1938.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.