APA (7th ed.) Citation

Verdoorn, F., & Alston, A. H. G. (1987). Manual of pteridology. A. Asher.

Chicago Style (17th ed.) Citation

Verdoorn, Frans, and A. H. G. Alston. Manual of Pteridology. Amsterdam: A. Asher, 1987.

MLA (9th ed.) Citation

Verdoorn, Frans, and A. H. G. Alston. Manual of Pteridology. A. Asher, 1987.