APA

Haffer J., .On the avifauna of the upper Patia valley, southwestern Colombia. : .

Chicago

Haffer Jurgen, .On the avifauna of the upper Patia valley, southwestern Colombia. : .

Harvard

Haffer J., .On the avifauna of the upper Patia valley, southwestern Colombia. : .

MLA

Haffer Jurgen, .: . .