APA

(2001). Status, impacts and trends of alien species that threaten ecosystems, habitats and species. s.l: UNEP.

Chicago

2001. Status, impacts and trends of alien species that threaten ecosystems, habitats and species. s.l: UNEP.

Harvard

(2001). Status, impacts and trends of alien species that threaten ecosystems, habitats and species. s.l: UNEP.

MLA

Status, impacts and trends of alien species that threaten ecosystems, habitats and species. s.l: UNEP. 2001.