Morgans, H., & Morgans, H. S. (1997). Early to middle Jurassic stratigraphic development, vegetation and climate change in north-western Europe.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Morgans, H., و Helen Sarah Morgans. Early to Middle Jurassic Stratigraphic Development, Vegetation and Climate Change in North-western Europe. 1997.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Morgans, H., و Helen Sarah Morgans. Early to Middle Jurassic Stratigraphic Development, Vegetation and Climate Change in North-western Europe. 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.