(en-GB) Charles Arthur et technology editor, « How low-paid workers at 'click farms' create appearance of online popularity », The Guardian, (ISSN0261-3077, lire en ligne, consulté le )
(en-GB) Charles Arthur et technology editor, « How low-paid workers at 'click farms' create appearance of online popularity », The Guardian, (ISSN0261-3077, lire en ligne, consulté le )