APA (7th ed.) Citation

SpringerLink (Online service), Verdoorn, F., & Alston, A. H. G. (1938). Manual of pteridology. M. Nijhoff.

Chicago Style (17th ed.) Citation

SpringerLink (Online service), Frans Verdoorn, and A. H. G. Alston. Manual of Pteridology. The Hague: M. Nijhoff, 1938.

MLA (9th ed.) Citation

SpringerLink (Online service), et al. Manual of Pteridology. M. Nijhoff, 1938.