| 1 | O. Bett, Wookey, Survex 1.0.39 Manual: survex datafile, Web , http://www.survex.com/docs/manual/datafile.html |
| 2 | L. Blaek, Therion for plain cavers, Web , http://www.infonegocio.com/tatel/therion_for_cavers.txt |
| 3 | Wookey, Therion - State of the art cave-drawing software, Compass Point 33 2004 5-12 |
| 4 | S. Mudrak, M. Budaj, The Therion book, Web , http://therion.speleo.sk/stats/get.php?filename=thbook.pdf |
| 5 | D. Loeffler, Drawing up cave surveys by computer: the Tunnel software suite, Compass Point 35 2006 11-16 |
| 6 | R. Hartley, Carto: present and future, Caves.com 8 2004 13 |
| 7 | G. Petrie, WinKarst survey software, CaveDiggers.com 1 2002 10 |
| 8 | G. Petrie, WinKarst version 9.0, CaveDiggers.com 2 2002 20-22 |
| 9 | G. Petrie, WinKarst v 10.0, Caves.com 6 2003 19 |
| 10 | T. Lounsbury, Cave maps by xarax, Caves.com 8 2004 4-12 |
| 11 | J.P. Cassou, Project Hades, Web , http://siliconcavings.chez-alice.fr/ |