Peter Silverton, Filthy English: The How, Why, When And What Of Everyday Swearing, Publisher Portobello Books, 2011, ISBN1846274524, 9781846274527, 256 pages, page
Deborah Cameron, "Naming of Parts: Gender, Culture, and terms for the penis among American college students (1995)", in The Routledge language and cultural theory reader, edited by Lucy Burke, Tony Crowley, Publisher Routledge, 2000, ISBN0-415-18681-1, ISBN978-0-415-18681-0, 511 pages (page 207)