Cita APA

Blokhuis, W. A. (1993). Vertisols in the central clay plain of the Sudan. s.n..

Citación estilo Chicago

Blokhuis, W. A. Vertisols in the Central Clay Plain of the Sudan. [Netherlands?: s.n., 1993.

Cita MLA

Blokhuis, W. A. Vertisols in the Central Clay Plain of the Sudan. s.n., 1993.

Warning: These citations may not always be 100% accurate.