Remarks As Prepared for Delivery by President Barack Obama, Address to the United Nations General Assembly, obamawhitehouse.archives.gov. September 24, 2014.
William Falconer (1784). “An Universal Dictionary of the Marine: Or, A Copious Explanation of the Technical Terms and Phrases Employed in the Construction, Equipment, Furniture, Machinery, Movements, and Military Operations of a Ship”, p.238
"De architectura (Ten Books on Architecture)". Book by Marcus Vitruvius Pollio (Book II, Chapter X "Highland and Lowland Fir", Section 1), circa 15 BC.