(en-GB) Stephanie Kirchgaessner, « FBI warned prominent US Sikhs of threats after murder of Hardeep Singh Nijjar in Canada », The Guardian, (ISSN0261-3077, lire en ligne, consulté le )
(en-GB) Stephanie Kirchgaessner, « FBI warned prominent US Sikhs of threats after murder of Hardeep Singh Nijjar in Canada », The Guardian, (ISSN0261-3077, lire en ligne, consulté le )