APA

Janzen D. H., .Uncertain future of the tropics:" the developed nations should return some of the resources ripped off the tropics over the past 400 years". : .

Chicago

Janzen Daniel H, .Uncertain future of the tropics:" the developed nations should return some of the resources ripped off the tropics over the past 400 years". : .

Harvard

Janzen D. H., .Uncertain future of the tropics:" the developed nations should return some of the resources ripped off the tropics over the past 400 years". : .

MLA

Janzen Daniel H, .: . .