Cita APA (7a ed.)

Frets, D. C. (1965). The geology of the Southern part of the Pisuerga basin and the adjacent area of Santibañez de Resoba, Palencia, Spain. [s.n.].

Cita Chicago Style (17a ed.)

Frets, D. C. The Geology of the Southern Part of the Pisuerga Basin and the Adjacent Area of Santibañez De Resoba, Palencia, Spain. [s.l.]: [s.n.], 1965.

Cita MLA (9a ed.)

Frets, D. C. The Geology of the Southern Part of the Pisuerga Basin and the Adjacent Area of Santibañez De Resoba, Palencia, Spain. [s.n.], 1965.