References
- De Bary . 1884 . Comparative Anatomy of the Phanerogams and Ferns Eng. trans.
- Solereder . 1908 . Systematic Anatomy of the Dicotyledons Eng. trans.
- Goebel . 1900 . Organography of Plants Eng. trans.
- Haberlandt . 1914 . Physiological Plant Anatomy Eng. trans.