APA

Ewan J., .Review of Purdieanthus and Lehmanniella, two endemic colombian genera of Gentianaceae, and biographical notes on purdie and lehmann. : .

Chicago

Ewan Joseph, .Review of Purdieanthus and Lehmanniella, two endemic colombian genera of Gentianaceae, and biographical notes on purdie and lehmann. : .

Harvard

Ewan J., .Review of Purdieanthus and Lehmanniella, two endemic colombian genera of Gentianaceae, and biographical notes on purdie and lehmann. : .

MLA

Ewan Joseph, .: . .