John Gay (1826). “Gay's Fables and Other Poems: Cotton's Visions in Verse ; Moore's Fables for the Female Sex ; with Sketches of the Authors' Lives”, p.197
"De architectura (Ten Books on Architecture)". Book by Marcus Vitruvius Pollio (Book II, Chapter X "Highland and Lowland Fir", Section 1), circa 15 BC.
"Gilmore Girls Creator Amy Sherman-Palladino Spills on the Future of the Show and More Scoop". Interview with Alyse Whitney, www.glamour.com. June 9, 2015.