APA

Constance L., Alverson W. S., .Second species of cotopaxia (<Umbelliferae/Apiaceae>), from Colombia. : .

Chicago

Constance Lincoln, Alverson William S, .Second species of cotopaxia (<Umbelliferae/Apiaceae>), from Colombia. : .

Harvard

Constance L., Alverson W. S., .Second species of cotopaxia (<Umbelliferae/Apiaceae>), from Colombia. : .

MLA

Constance Lincoln, Alverson William S, .: . .