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Foinse: “Cóc peitriliam: Essential to manufacturing” arna fhoilsiú ag an gCumann Náisiúnta Monaróirí, ar fáil ag www.api.org/~/media/files/news/2014/14-november/petcoke-one-pager.pdf; “Petcoke markets and the cement industry” arna fhoilsiú ag Cemnet, atá ar fáil ag www.cemnet.com/News/story/169503/petcoke-markets-and-the-cement-industry.html; arna rochtain go deireanach 17 Nollaig 2021.
Source: ‘Petroleum coke: essential to manufacturing’ published by the National Association of Manufacturers, available at www.api.org/~/media/files/news/2014/14-november/petcoke-one-pager.pdf; ‘Petcoke markets and the cement industry’ published by CemNET available at www.cemnet.com/News/story/169503/petcoke-markets-and-the-cement-industry.html accessed on 17 December 2021.