APA (7th ed.) Citation

Wulff, E. V. (1950). An introduction to historical plant geography. Chronica Botanica.

Chicago Style (17th ed.) Citation

Wulff, E. V. An Introduction to Historical Plant Geography. Waltham: Chronica Botanica, 1950.

MLA (9th ed.) Citation

Wulff, E. V. An Introduction to Historical Plant Geography. Chronica Botanica, 1950.