↑ Prehistoric man ate flatbread 30,000 years ago: study. Physorg.com. Agence France-Presse. 19 October 2010. Diakses tanggal 19 October 2010. ↑ McGee, Harold (2004). On food and cooking. Scribner. hlm.xa0517. ISBNxa00-684-80001-2. ↑ Tannahill, Reay (1973). Food in History. Stein and Day. hlm.xa068–69. ISBNxa00-8128-1437-1. ↑ Pliny the Elder (1938). Natural History. Loeb Classics. hlm.xa01.255. Generally however they do not heat it up at all, but only use the dough kept over from the day before; manifestly it is natural for sourness to make the dough ferment, ↑ Chorleywood Industrial Bread Making Process. allotment.org.uk