Não informado. (2001). South African journal of plant and soil. Foundation for Education, Science and Technology.
Lua i Stíl Chicago (17ú heag.)Não informado. South African Journal of Plant and Soil. Pretoria, Africa do Sul: Foundation for Education, Science and Technology, 2001.
Lua MLA (8ú heag.)Não informado. South African Journal of Plant and Soil. Foundation for Education, Science and Technology, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.