Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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