International Society for Rock Mechanics. Regional Symposium & Vrkljan, I. (2010). Rock engineering in difficult ground conditions - soft rocks and karst: Eurock 2009 : proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009, Dubrovnik, Cavtat, Croatia, 29-31 October 2009. CRC Press/Balkema.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Society for Rock Mechanics. Regional Symposium και Ivan Vrkljan. Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst: Eurock 2009 : Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009, Dubrovnik, Cavtat, Croatia, 29-31 October 2009. Leiden, The Netherlands: CRC Press/Balkema, 2010.
Παραπομπή σε μορφή MLA (9th εκδ.)International Society for Rock Mechanics. Regional Symposium και Ivan Vrkljan. Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst: Eurock 2009 : Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009, Dubrovnik, Cavtat, Croatia, 29-31 October 2009. CRC Press/Balkema, 2010.