APA

Moldenke H. N., . (1968). The vervains collected on the Galápagos Islands by Charles Darwin during the voyage of the "Beagle". : .

Chicago

Moldenke Harold N, . 1968. The vervains collected on the Galápagos Islands by Charles Darwin during the voyage of the "Beagle". : .

Harvard

Moldenke H. N., . (1968). The vervains collected on the Galápagos Islands by Charles Darwin during the voyage of the "Beagle". : .

MLA

Moldenke Harold N, . The vervains collected on the Galápagos Islands by Charles Darwin during the voyage of the "Beagle". : . 1968.