Smyth, William Henry (2008). The Sailor's Word: A Complete Dictionary of Nautical Terms from the Napoleonic and Victorian Navies. Fireship Press. p. 625. ISBN 978-1-934757-41-3. 978-1-934757-41-3 ↩
Sweet's Architectural Catalog File. Sweet's Division, McGraw-Hill Information Systems Company. 1918. p. 275. https://books.google.com/books?id=O9JBAQAAMAAJ&dq=scupper&pg=PA275 ↩