APA (7th ed.) Citation

Pearson, H. H. W. (1929). Gnetales. Cambridge University Press.

Chicago Style (17th ed.) Citation

Pearson, Henry Harold Welch. Gnetales. Cambridge: Cambridge University Press, 1929.

MLA (9th ed.) Citation

Pearson, Henry Harold Welch. Gnetales. Cambridge University Press, 1929.