Não informado. (2001). South African journal of plant and soil. Foundation for Education, Science and Technology.
Chicago-referens (17:e uppl.)Não informado. South African Journal of Plant and Soil. Pretoria, Africa do Sul: Foundation for Education, Science and Technology, 2001.
MLA-referens (8:e uppl.)Não informado. South African Journal of Plant and Soil. Foundation for Education, Science and Technology, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.