The Whitehead Torpedo, notes on handling etc. US: Bureau of Ordnance. 1890. Retrieved 15 May 2017 – via San Francisco Maritime National Park Association. After assembling, the air-flask shall be charged to 450 lbs. pressure
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Takaishi, Tatsuo; Numata, Akira; Nakano, Ryouji; Sakaguchi, Katsuhiko (March 2008). "Approach to High Efficiency Diesel and Gas Engines"(PDF). Mitsubishi Heavy Industries Technical Review. 45 (1). Retrieved 4 February 2011.