Παραπομπή APA

Gurney, R. (1931). British freshwater cope poda V1. Ray society.

Παραπομπή Chicago Style

Gurney, Robert. British Freshwater Cope Poda V1. London: Ray society, 1931.

Παραπομπή MLA

Gurney, Robert. British Freshwater Cope Poda V1. Ray society, 1931.