Philbrick, J. H., & Philbrick, H. (1971). Organic gardening for health and nutrition: An introduction to the method of bio-dynamic gardening inaugurated by Rudolf Steiner. Castle Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philbrick, John H., و Helen Philbrick. Organic Gardening for Health and Nutrition: An Introduction to the Method of Bio-dynamic Gardening Inaugurated by Rudolf Steiner. New York: Castle Books, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Philbrick, John H., و Helen Philbrick. Organic Gardening for Health and Nutrition: An Introduction to the Method of Bio-dynamic Gardening Inaugurated by Rudolf Steiner. Castle Books, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.