Title: Ahlat 2010: Quarta campagna di indagini sulle strutture rupestri / Fourth campaign of surveys on the underground structures, Author: Roberto Bixio
Title: Ani 2004: Surveys on the Underground Settlements, Author: Roberto Bixio
Title: Ahlat 2009: Terza campagna di indagini sulle strutture rupestri / Third campaign of surveys on the underground structures, Author: Roberto Bixio
Title: Cappadocia: Schede dei siti sotterranei: Records of the underground sites, Author: Roberto Bixio
Title: Ahlat 2008: Seconda campagna di indagini sulle strutture rupestri / Second campaign of surveys on the underground structures, Author: Roberto Bixio
Title: Ahlat 2007: Indagini preliminari sulle strutture rupestri, Author: Roberto Bixio