APA (7th ed.) Citation

Yeo, P. (1993). Geraniaceae group: The species of Pelargonium. The Geraniceae Group.

Chicago Style (17th ed.) Citation

Yeo, Peter. Geraniaceae Group: The Species of Pelargonium. Dover [u.a.]: The Geraniceae Group, 1993.

MLA (9th ed.) Citation

Yeo, Peter. Geraniaceae Group: The Species of Pelargonium. The Geraniceae Group, 1993.

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