* Arjen van der Wal & Robert Vuik, [http://www.practica.org/wp-content/uploads/services/publications/drilling%20manuals/EN/sludging%20_final%20version_lr%20310811%20full%20ENG.pdf Sludging: Manual Drilling Series. Technical Training Handbook on Affordable Manual Well Drilling]. Practica Foundation, June 2011 (2nd edition). French version: [http://www.practica.org/wp-content/uploads/services/publications/drilling%20manuals/FR/sludging_final%20version-lr%20310811%20full%20FR.pdf FORAGE A LA BOUE : Serie forage manuel].
*[http://wwwec.practicafoundationeuropa.nleu/wp-contentecho/files/evaluation/watsan2005/uploadsannex_files/PDFPRACTICA/PracticaPRACT2%20drilling20-%20Rs20Rota-sludge%20versie20and%201th20stone%20september20hammer%200520drilling.pdf Rota-sludge and stone hammer drilling, Part 1, Drilling manual]. Produced by [http://www.practicafoundation.nl PRACTICA Foundation] and [http://www.etc-international.org/index.php?id=41 ETC Foundation].
*[http://www.practicafoundationsswm.nlinfo/wp-contentsites/uploadsdefault/PDFfiles/practica-production-rs-versie-1th-september-051reference_attachments/HERWIJNEN%202005%20Rota%20Sludge%20and%20Stone%20Hammer%20Drilling%20Part%20two%20Production%20Manual.pdf Rota-sludge and stone hammer drilling, Part 2, Production manual]. Produced by [http://www.practicafoundation.nl PRACTICA Foundation] and [http://www.etc-international.org/index.php?id=41 ETC Foundation].
* [http://www.practica.org/products/drilling-wells/ Drilling & Wells], Practica Foundation.
{{#ev:youtube|MvebFHCjCvk|200|auto|<font size="2"><center>Rota sludge drilling in <br>Madagascar, January 2008</center></font>}}
=== Acknowledgements===
* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.practicafoundation.nl/ Practica Foundation], and from the [http://www.rural-water-supply.net/ Rural Water Supply Network], and specifically its [http://www.rural-water-supply.net/en/implementation/manual-drilling manual drilling section].
* [http://www.lboro.ac.uk/well/resources/technical-briefs/43-simple-drilling-methods.pdf 43. Simple drilling methods.] WEDC.
