APA (7th ed.) Citation

Hagerup, O. On the origin of some Angiosperms through the Gnetales and the Coniferae. Levin & Munksgaard.

Chicago Style (17th ed.) Citation

Hagerup, Olaf. On the Origin of Some Angiosperms Through the Gnetales and the Coniferae. København: Levin & Munksgaard.

MLA (9th ed.) Citation

Hagerup, Olaf. On the Origin of Some Angiosperms Through the Gnetales and the Coniferae. Levin & Munksgaard.

Warning: These citations may not always be 100% accurate.