APA (7th ed.) Citation

Outer, R. W. d. (1967). Histological Investigations of the secondary phloem of gymnosperms.

Chicago Style (17th ed.) Citation

Outer, Robert W. den. Histological Investigations of the Secondary Phloem of Gymnosperms. 1967.

MLA (9th ed.) Citation

Outer, Robert W. den. Histological Investigations of the Secondary Phloem of Gymnosperms. 1967.

Warning: These citations may not always be 100% accurate.