APA (7th ed.) Citation

Street, H. E., & Öpik, H. (1970). The physiology of flowering plants: Their growth and development. American Elsevier.

Chicago Style (17th ed.) Citation

Street, H. E., and Helgi Öpik. The Physiology of Flowering Plants: Their Growth and Development. New York: American Elsevier, 1970.

MLA (9th ed.) Citation

Street, H. E., and Helgi Öpik. The Physiology of Flowering Plants: Their Growth and Development. American Elsevier, 1970.