Não informado. (2001). South African journal of plant and soil. Foundation for Education, Science and Technology.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. South African Journal of Plant and Soil. Pretoria, Africa do Sul: Foundation for Education, Science and Technology, 2001.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. South African Journal of Plant and Soil. Foundation for Education, Science and Technology, 2001.
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