Antični kamenni kotvi, kamenni i olovni štokove ot kolekcijata na Nacionalnija Istoričeski Muzej : kraja na II chil. pr. Chr. - III v. sl. Chr. = Antique stone anchors, stone and lead anchor stocks from the collection of the National Museum of History - Christov, Ivan 1970- (UNICART, 2013)
Text in Bulgarian and English. - In Cyrillic script