APA

Avalos G., Soto A. & Alfaro W.Effect of artificial feeders on pollen loads of the hummingbirds of Cerro de la Muerte, Costa Rica. : .

Chicago

Avalos Gerardo, Soto Alejandra and Alfaro Willy.Effect of artificial feeders on pollen loads of the hummingbirds of Cerro de la Muerte, Costa Rica. : .

Harvard

Avalos G., Soto A. and Alfaro W.Effect of artificial feeders on pollen loads of the hummingbirds of Cerro de la Muerte, Costa Rica. : .

MLA

Avalos Gerardo, Soto Alejandra and Alfaro Willy.: . .