Não informado. (1919). Memoirs of the Botanical Survey of South Africa. Department of Agricultural Technical Services, Botanical Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Memoirs of the Botanical Survey of South Africa. Pretoria, Africa do Sul: Department of Agricultural Technical Services, Botanical Research, 1919.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Memoirs of the Botanical Survey of South Africa. Department of Agricultural Technical Services, Botanical Research, 1919.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.