APA

Beetle A. a., .Notes on the nomenclature of south american species of Scirpus. : .

Chicago

Beetle Alan a, .Notes on the nomenclature of south american species of Scirpus. : .

Harvard

Beetle A. a., .Notes on the nomenclature of south american species of Scirpus. : .

MLA

Beetle Alan a, .: . .