Não informado. (1920). Journal of the Department of Agriculture of the Union of South Africa. Union of South Africa, Department of Agriculture.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Journal of the Department of Agriculture of the Union of South Africa. Pretoria, Africa do Sul: Union of South Africa, Department of Agriculture, 1920.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Journal of the Department of Agriculture of the Union of South Africa. Union of South Africa, Department of Agriculture, 1920.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.