Cita APA (7th ed.)

Catling, P. M. (1997). The problem of invading alien trees and shrubs: Some observations in Ontario and a Canadian checklist. Zenodo.

Cita Chicago (17th ed.)

Catling, Paul M. The Problem of Invading Alien Trees and Shrubs: Some Observations in Ontario and a Canadian Checklist. Zenodo, 1997.

Cita MLA (9th ed.)

Catling, Paul M. The Problem of Invading Alien Trees and Shrubs: Some Observations in Ontario and a Canadian Checklist. Zenodo, 1997.