Cita APA (7a ed.)

Pérez de Calleja, A. The group of cooperatives at Mondragon in the Spanish Basque country. [s.n.].

Cita Chicago Style (17a ed.)

Pérez de Calleja, Antonio. The Group of Cooperatives at Mondragon in the Spanish Basque Country. [S.l.]: [s.n.].

Cita MLA (9a ed.)

Pérez de Calleja, Antonio. The Group of Cooperatives at Mondragon in the Spanish Basque Country. [s.n.].