Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.

APA Citation Edition Citation

Janssen, R. E. (1939). Leaves and stems from fossil forests: A handbook of the paleobotanical collections in the Illinois State Museum. Illinois State Museum.

Chicago Citation Edition Citation

Janssen, Raymond E. Leaves and Stems from Fossil Forests: A Handbook of the Paleobotanical Collections in the Illinois State Museum. Springfield-IL: Illinois State Museum, 1939.

MLA Citation Edition Citation

Janssen, Raymond E. Leaves and Stems from Fossil Forests: A Handbook of the Paleobotanical Collections in the Illinois State Museum. Illinois State Museum, 1939.