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Johnstone, M.  (2006, May 25). Campbell, John Ross (1894–1969), political organizer and newspaper editor. Oxford Dictionary of National Biography. Retrieved 20 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-56741.

Johnstone, Monty. "Campbell, John Ross (1894–1969), political organizer and newspaper editor." Oxford Dictionary of National Biography.  May 25, 2006. Oxford University Press. Date of access 20 Apr. 2021, <https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-56741>

Johnstone, Monty. "Campbell, John Ross (1894–1969), political organizer and newspaper editor." Oxford Dictionary of National Biography. 23 Sep. 2004; Accessed 20 Apr. 2021. https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-56741.