^Hickman، Leo (28 أغسطس 2013). "The era of climate change 'denial' is over". The Guardian. مؤرشف من الأصل في 2018-10-04. اطلع عليه بتاريخ 2013-08-28. A personal note: after 16 years working as a Guardian journalist, this is my final article. Next month, I will take up the role of chief advisor, climate change at WWF-UK.
^Hickman، Leo (2006). "Make apathy history"(PDF). Falmer: The University of Sussex Magazine. ج. 43: 18–19. مؤرشف من الأصل(PDF) في 2016-03-03. اطلع عليه بتاريخ 2012-11-20. Leo Hickman (ENGAM 1991) is a journalist, author and editor at The Guardian.
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