APA

Campbell Steere W., .Bryophyta of artic America. II: species collected by Dewey Soper, principally in southern Baffin Island. : .

Chicago

Campbell Steere William, .Bryophyta of artic America. II: species collected by Dewey Soper, principally in southern Baffin Island. : .

Harvard

Campbell Steere W., .Bryophyta of artic America. II: species collected by Dewey Soper, principally in southern Baffin Island. : .

MLA

Campbell Steere William, .: . .