APA (7th ed.) Citation

Gelert, O., Ostenfeld, C. H., & New York Botanical Garden, L. T. M. L. Pteridophyta, Gymnospermae and Monocotyledones. Copenhagen, Nordiske forlag, 1902.

Chicago Style (17th ed.) Citation

Gelert, O., C. H. Ostenfeld, and LuEsther T. Mertz Library New York Botanical Garden. Pteridophyta, Gymnospermae and Monocotyledones. Copenhagen, Nordiske forlag, 1902.

MLA (9th ed.) Citation

Gelert, O., et al. Pteridophyta, Gymnospermae and Monocotyledones. Copenhagen, Nordiske forlag, 1902.