Tennis Terms (engraving) by English School, (19th century)
Love, Ace, Set... All Tennis Terms Explained | Tennis Glossary | Keith Prowse
Glossary of tennis terms - Wikipedia
Why is Tennis Scored the Way it is? (Tennis Scoring History) - The Tennis Bros
OED serves up volley of new definitions from tennis | Reference and languages books | The Guardian
Milwaukee Tennis & Education Foundation (MTEF) - The curious origins of tennis terms such as "deuce," "ace," and the forgotten "sphairistike" from the Oxford English Dictionary: http://public.oed.com/the-oed-today/recent-updates-to-the-oed/june-2017 ...