APA

Hilty S. L., .Notes on birds at swarms of army ants in the highlands of Colombia. : .

Chicago

Hilty Steven L, .Notes on birds at swarms of army ants in the highlands of Colombia. : .

Harvard

Hilty S. L., .Notes on birds at swarms of army ants in the highlands of Colombia. : .

MLA

Hilty Steven L, .: . .