APA (7th ed.) Citation

Heer, O. (1868). Flora fossilis arctica: Die fossile Flora der Polarländer.

Chicago Style (17th ed.) Citation

Heer, Oswald. Flora Fossilis Arctica: Die Fossile Flora Der Polarländer. Zürich, 1868.

MLA (9th ed.) Citation

Heer, Oswald. Flora Fossilis Arctica: Die Fossile Flora Der Polarländer. 1868.

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