BoB National. http://bobnational.net/.
Copac (National, Academic and Specialist Library Catalogue). http://copac.ac.uk/.
Dogpile (Web Search). http://www.dogpile.com/.
DuckDuckGo. https://duckduckgo.com/.
Ellis, Markman. Eighteenth Century Coffee-House Culture. Pickering & Chatto, 2006.
Explore (UCL Library Catalogue). http://www.ucl.ac.uk/library/explore/.
Google. https://www.google.co.uk.
Office for National Statistics (ONS) - ONS. http://www.ons.gov.uk/ons/index.html.
Phil Bradley: Which Search Engine When? http://www.philb.com/whichengine.htm.
Roseberry, William. ‘The Rise of Yuppie Coffees and the Reimagination of Class in the United States’. American Anthropologist, vol. 98, no. 4, Dec. 1996, pp. 762–75, https://doi.org/10.1525/aa.1996.98.4.02a00070.
The Coffee Trail with Simon Reeve | BoB National. http://bobnational.net/start-session?entityID=https://shib-idp.ucl.ac.uk/shibboleth&target=http://bobnational.net/record/197794/media_id/199575.
TRIP Database. http://www.tripdatabase.com/search/advanced.
Welcome to East View - Social Movements, Elections, Ephemera. http://dlib.eastview.com/browse/udb/1590.