"Elephant's Toothpaste"(PDF). University of Utah Chemistry Demonstrations. University of Utah. Diarsipkan dari versi asli(PDF) tanggal 2014-12-23. Diakses tanggal 21 March 2014.
web.archive.org
"Elephant's Toothpaste"(PDF). University of Utah Chemistry Demonstrations. University of Utah. Diarsipkan dari versi asli(PDF) tanggal 2014-12-23. Diakses tanggal 21 March 2014.