found: Bóg, kasa, i rock 'n' roll, 2011:t.p. (Marcin Prokop)
found: OCLC, March 12, 2012(hdg: Prokop, Marcin; usage: Marcin Prokop)
found: Katalogi Biblioteki Narodowej (Catalogs of the National Library of Poland) WWW home page, March 12, 2012(Prokop, Marcin (1977- ))
found: Wikipedia, viewed April 6, 2023:Polish Marcin Prokop page (Marcin Prokop; born 14 July 1977 in Warsaw; Polish journalist, television presenter, feuilletonist, writer, publicist, and television personality; lives in Warsaw) - https://pl.wikipedia.org/wiki/Marcin_Prokop