APA (7th ed.) Citation

Frahm, J. (1987). A revised list of the Campylopus species of the world. Duell-Hermanns.

Chicago Style (17th ed.) Citation

Frahm, Jan-Peter. A Revised List of the Campylopus Species of the World. Rheurdt: Duell-Hermanns, 1987.

MLA (9th ed.) Citation

Frahm, Jan-Peter. A Revised List of the Campylopus Species of the World. Duell-Hermanns, 1987.