Não informado. (1960). Geomorphological abstracts. Department of Geography, School of Economics and Political Science.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Geomorphological Abstracts. London: Department of Geography, School of Economics and Political Science, 1960.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Geomorphological Abstracts. Department of Geography, School of Economics and Political Science, 1960.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.