National Conference of South African Surveyors & National Conference of South African Surveyors. Proceedings of the National Conference of South African Surveyors. National Conference of South African Surveyors.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Conference of South African Surveyors و National Conference of South African Surveyors. Proceedings of the National Conference of South African Surveyors. Cape Town: National Conference of South African Surveyors.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)National Conference of South African Surveyors و National Conference of South African Surveyors. Proceedings of the National Conference of South African Surveyors. National Conference of South African Surveyors.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.