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.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPhilbrick, John H., এবং 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.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিPhilbrick, John H., এবং Helen Philbrick. Organic Gardening for Health and Nutrition: An Introduction to the Method of Bio-dynamic Gardening Inaugurated by Rudolf Steiner. Castle Books, 1971.
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