De Hertogh, A., & Le Nard, M. (1993). The physiology of flower bulbs: A comprehensive treatise on the physiology and utilization of ornamental flowering bulbous and tuberous plants. Amsterdam, London, New York, Tokyo: Elsevier Science Publishers B.V..
Chicago Style CitationDe Hertogh, August., and Marcel Le Nard. The Physiology of Flower Bulbs: A Comprehensive Treatise On the Physiology and Utilization of Ornamental Flowering Bulbous and Tuberous Plants. Amsterdam, London, New York, Tokyo: Elsevier Science Publishers B.V., 1993.
MLA CitationDe Hertogh, August., and Marcel Le Nard. The Physiology of Flower Bulbs: A Comprehensive Treatise On the Physiology and Utilization of Ornamental Flowering Bulbous and Tuberous Plants. Amsterdam, London, New York, Tokyo: Elsevier Science Publishers B.V., 1993.