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"What we do". www.fao.org. Food and Agriculture Organization of the United Nations. 2016. Diarsipkan dari versi asli tanggal 2018-10-22. Diakses tanggal 2016-10-25.
Morley, Neville (2005). "Feeding Ancient Rome". Bath Royal Literacy and Scientific Institution. Diarsipkan dari versi asli tanggal 2016-11-18. Diakses tanggal 2016-10-20.