APA

Adsersen H., . (1977). New records of Pteridophytes from the Galápagos Islands. : .

Chicago

Adsersen Henning, . 1977. New records of Pteridophytes from the Galápagos Islands. : .

Harvard

Adsersen H., . (1977). New records of Pteridophytes from the Galápagos Islands. : .

MLA

Adsersen Henning, . New records of Pteridophytes from the Galápagos Islands. : . 1977.