APA (7th ed.) Citation

Clarke, G. C. S., & Punt, W. The Northwest European pollen flora.

Chicago Style (17th ed.) Citation

Clarke, G. C. S., and W. Punt. The Northwest European Pollen Flora.

MLA (9th ed.) Citation

Clarke, G. C. S., and W. Punt. The Northwest European Pollen Flora.

Warning: These citations may not always be 100% accurate.