Eksterne henvisninger Towson University Arkiveret 22. juli 2010 hos Wayback Machine Heartfield's Online Art Brasscheck Heartfield versus Hitler Autoritetsdata WorldCat VIAF: 120725202 LCCN: n79139067 ISNI: 0000 0000 8189 4288 GND: 118547437 SELIBR: 336452 SUDOC: 026917017 BNF: cb11907082q (data) BIBSYS: 90192478 ULAN: 500018521 MusicBrainz: 1ff6f65c-e3c2-466f-9fd4-90cde55bf30c NLA: 35182980 NDL: 00442820 NKC: jn20000700683 ICCU: RAVV060432 BNE: XX1302321 CiNii: DA00395962 RKD: 36746 DSD: John_Heartfield