Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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