Cita APA (7a ed.)

Willan, R. C. (1987). Phylogenetic Systematics of the Notaspidea (Opisthobranchia) with Reappraisal of Families and Genera. Zenodo.

Cita Chicago Style (17a ed.)

Willan, Richard C. Phylogenetic Systematics of the Notaspidea (Opisthobranchia) with Reappraisal of Families and Genera. Zenodo, 1987.

Cita MLA (9a ed.)

Willan, Richard C. Phylogenetic Systematics of the Notaspidea (Opisthobranchia) with Reappraisal of Families and Genera. Zenodo, 1987.