Cita APA (7a ed.)

Curt, E. G. (1979). Skipper. [s.n.].

Cita Chicago Style (17a ed.)

Curt, Enrique G. Skipper. Barcelona: [s.n.], 1979.

Cita MLA (9a ed.)

Curt, Enrique G. Skipper. [s.n.], 1979.