Christensen, H. N. (1964). pH and dissociation: A learning program for students of the biological and medical sciences (2d ed.). Saunders College Publishing.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Christensen, Halvor N. PH and Dissociation: A Learning Program for Students of the Biological and Medical Sciences. 2d ed. Philadelphia: Saunders College Publishing, 1964.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Christensen, Halvor N. PH and Dissociation: A Learning Program for Students of the Biological and Medical Sciences. 2d ed. Saunders College Publishing, 1964.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.