APA

Callicott J. B., Mumford K., .Ecological sustainability as a conservation concept. : .

Chicago

Callicott J Baird, Mumford Karen, .Ecological sustainability as a conservation concept. : .

Harvard

Callicott J. B., Mumford K., .Ecological sustainability as a conservation concept. : .

MLA

Callicott J Baird, Mumford Karen, .: . .