Deng, Yinke (2005). Ancient Chinese Inventions. Beijing: China Intercontinental Press. ISBN978-7508508375., cited in Joel Serrão, Dicionário de História de Portugal, Vol III. Porto: Livraria Figueirinhas, 1981, 184–185.
„Balloon Propane Tanks“. Pilot Outlook. Suarchyvuotas originalas 2011-06-10. Nuoroda tikrinta 2010-06-05. „Propane tanks used in hot air balloons are mainly constructed of either aluminum or stainless steel. Most aluminum tanks are vertical 10-gallon cylinders (DOT 4E240), built primarily for forklift trucks.“
propane101.com
„Propane Cylinders“. Propane 101. Nuoroda tikrinta 2010-06-05. „Cylinders in liquid service are commonly found on forklifts.“
„Balloon Propane Tanks“. Pilot Outlook. Suarchyvuotas originalas 2011-06-10. Nuoroda tikrinta 2010-06-05. „Propane tanks used in hot air balloons are mainly constructed of either aluminum or stainless steel. Most aluminum tanks are vertical 10-gallon cylinders (DOT 4E240), built primarily for forklift trucks.“