1. Pojizerský sborník 4/1999 Creator: Nechvíle, Martin Type: article and TEXT Language: Czech Description: 80-96360-20-2 Rights: http://creativecommons.org/publicdomain/mark/1.0/
2. Zdeněk Fišera: Skalní hrady zemí Koruny české Creator: Nechvíle, Martin Type: article and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/