Cita APA (7a ed.)

Benl, G. (1982). The pteridophyta of Fernando Po (contributions to a Flora of the island). Universitat de Barcelona.

Cita Chicago Style (17a ed.)

Benl, G. The Pteridophyta of Fernando Po (contributions to a Flora of the Island). Barcelona: Universitat de Barcelona, 1982.

Cita MLA (9a ed.)

Benl, G. The Pteridophyta of Fernando Po (contributions to a Flora of the Island). Universitat de Barcelona, 1982.