Nijland, H. J. (2005). Subsurface drainage practices: Guidelines for the implementation, operation and maintenance of subsurface pipe drainage systems. Wageningen, Netherlands: International Institute for Land Reclamation and Improvement (ILRI).
Παραπομπή Chicago StyleNijland, H. J. Subsurface Drainage Practices: Guidelines for the Implementation, Operation and Maintenance of Subsurface Pipe Drainage Systems. Wageningen, Netherlands: International Institute for Land Reclamation and Improvement (ILRI), 2005.
Παραπομπή MLANijland, H. J. Subsurface Drainage Practices: Guidelines for the Implementation, Operation and Maintenance of Subsurface Pipe Drainage Systems. Wageningen, Netherlands: International Institute for Land Reclamation and Improvement (ILRI), 2005.