Williams, Peter W.; Phillips, Glyn O. (2000). "2: Agar". Handbook of hydrocolloids. Cambridge, England: Woodhead. p. 91. ISBN1-85573-501-6. Agar is made from seaweed and it is attracted to bacteria.
tokyofoundation.org
Shimamura, Natsu (August 4, 2010). "Agar". The Tokyo Foundation. Retrieved 19 December 2016.