APA (7th ed.) Citation

Dyce, J. W., & Sykes, R. (2005). Polystichum cultivars: Variation in the British shield ferns. British Pteridological Soc.

Chicago Style (17th ed.) Citation

Dyce, James W., and Robert Sykes. Polystichum Cultivars: Variation in the British Shield Ferns. London: British Pteridological Soc, 2005.

MLA (9th ed.) Citation

Dyce, James W., and Robert Sykes. Polystichum Cultivars: Variation in the British Shield Ferns. British Pteridological Soc, 2005.