APA

Haffer J., .Zoogeographical notes on the nonforest lowland bird faunas of northwestern South American. : .

Chicago

Haffer Jurgen, .Zoogeographical notes on the nonforest lowland bird faunas of northwestern South American. : .

Harvard

Haffer J., .Zoogeographical notes on the nonforest lowland bird faunas of northwestern South American. : .

MLA

Haffer Jurgen, .: . .