Cita APA (7th ed.)

Silver, N. (1992). Pterodactyls. [o.V.].

Cita Chicago (17th ed.)

Silver, Nicky. Pterodactyls. [o.O.]: [o.V.], 1992.

Cita MLA (8th ed.)

Silver, Nicky. Pterodactyls. [o.V.], 1992.