FAO - CINCAU

http://agris.fao.org/agris-search/search.do?recordID=ID2004001157

CARA PENGAWETAN BAHAN MAKANAN

http://dataiptek.blogspot.my/2013/02/Pengawetan-Pangan.html

HOW DO I MAKE MY CAKE LAST FOR A WEEK

http://www.bakerpedia.com/ingredients/artificial-preservatives/

ARTIFICIAL PRESERVATIVE

http://www.bakerpedia.com/ingredients/artificial-preservatives/

SUPERMARKET AND BAKERY BREAD

https://www.choice.com.au/food-and-drink/bread-cereal-and-grains/bread/articles/bread-guide

THE BREAD PRESERVATIVE

http://fedup.com.au/factsheets/additive-and-natural-chemical-factsheets/280-283-propionic-acid-and-its-salts-the-bread-preservative

PENGAWET ROTI

http://fedup.com.au/factsheets/additive-and-natural-chemical-factsheets/280-283-propionic-acid-and-its-salts-the-bread-preservative