(en-GB) « ‘They found ways to do the impossible’: Hipgnosis, the designers who changed the record sleeve for ever », The Guardian, (ISSN0261-3077, lire en ligne, consulté le )
theguardian.com
(en-GB) « ‘They found ways to do the impossible’: Hipgnosis, the designers who changed the record sleeve for ever », The Guardian, (ISSN0261-3077, lire en ligne, consulté le )