Burger, Reinhold; Aschenbrenner, Albert (8 May 1906). "Field or hunting flask". United States Patent Office. Diakses tanggal 4 February 2019 – via DepatisNet.DPMA.de.
jimdo.com
thermosflasche.jimdo.com
Burger, Reinhold (30 August 1904). "Warenzeichen 'Thermos'". Auszug aus der vom Deutschen Patentamt weitergeführten Zeichenrolle des Reichspatentamts. Diarsipkan dari versi asli tanggal 2019-02-04. Diakses tanggal 4 February 2019 – via ThermosFlasche.Jimdo.com.
"About Thermos". 2010. Diarsipkan dari versi asli tanggal 2017-08-10. Diakses tanggal 30 December 2010.
"FAQ". Thermos.com. Thermos LLC. 2019. legal notice at page-bottom. Diakses tanggal 8 December 2019.. It is unclear what the Thermos website really means by the strange expression "in over 115 countries"; it could suggest "exactly 116", or that whoever put together the website materials wasn't certain of the true number and stopped counting at 115.
web.archive.org
"About Thermos". 2010. Diarsipkan dari versi asli tanggal 2017-08-10. Diakses tanggal 30 December 2010.
Burger, Reinhold (30 August 1904). "Warenzeichen 'Thermos'". Auszug aus der vom Deutschen Patentamt weitergeführten Zeichenrolle des Reichspatentamts. Diarsipkan dari versi asli tanggal 2019-02-04. Diakses tanggal 4 February 2019 – via ThermosFlasche.Jimdo.com.