Jenkyns, H., Gale, A., & Corfield, R. (1994). CARBON-ISOTOPE AND OXYGEN-ISOTOPE STRATIGRAPHY OF THE ENGLISH CHALK AND ITALIAN SCAGLIA AND ITS PALEOCLIMATIC SIGNIFICANCE.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Jenkyns, H., A. Gale, و R. Corfield. CARBON-ISOTOPE AND OXYGEN-ISOTOPE STRATIGRAPHY OF THE ENGLISH CHALK AND ITALIAN SCAGLIA AND ITS PALEOCLIMATIC SIGNIFICANCE. 1994.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Jenkyns, H., et al. CARBON-ISOTOPE AND OXYGEN-ISOTOPE STRATIGRAPHY OF THE ENGLISH CHALK AND ITALIAN SCAGLIA AND ITS PALEOCLIMATIC SIGNIFICANCE. 1994.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.