Cita APA (7a ed.)

Shirihai, H., Gargallo, G., Helbig, A. J., Harris, A., & Cottridge, D. (2001). Sylvia warblers: Identification, taxonomy and phylogeny of the genus "Sylvia". Christopher Helm.

Cita Chicago Style (17a ed.)

Shirihai, Hadoram, Gabriel Gargallo, Andreas J. Helbig, Alan Harris, y David Cottridge. Sylvia Warblers: Identification, Taxonomy and Phylogeny of the Genus "Sylvia". London: Christopher Helm, 2001.

Cita MLA (9a ed.)

Shirihai, Hadoram, et al. Sylvia Warblers: Identification, Taxonomy and Phylogeny of the Genus "Sylvia". Christopher Helm, 2001.