The De La Rue Years 1878-1910, vol.1 and vol.2, by W. A. Wiseman
Great Britain Specialised Stamp Catalogue Volume 1: Queen Victoria (16th Edition), published by Stanley Gibbons, 2012
The Plating Of The Half Penny 1887-1900 by G. C. Akerman
Notes on Controls Part 1 Victorian Period by Rowell
A Guide to 1887 1/2d Controls by A. Wiseman
British Postage Stamp Varieties Illustrated by Alcock & Meredith, 1949
The Englishman Who Posted Himself And Other Curious Objects by John Tingey
Encyclopaedia of British Empire Postage Stamps Volume 1 by Robson Lowe
Auction Catalogues and Named Sales
1976 Jan. 13th, Rosbon Lowe, Great Britain Hand Painted Essays for the 1884-1892 Stamp Committee
1988 Nov. 3, Phillips, The Ernest Good FRPSL Collection of Great Britain 1887-1900 Jubilee Issue Postage Stamps
1996 Dec. 17, Christie’s Robson Lowe, Great Britain Stamps and Postal History (featuring part 1 of the Jeffrey K. Weiss FRPSL Gold medal collection of 1887 Jubilee issue)
2016 Feb., Stanley Gibbons, The “Aureum” Collection (pdf catalogue)
The Great Britain Philatelic Society
About: The GBPS helps members with all aspects of GB philately. They meet 8 times a year, usually in London, to hold special collector presentations as well as member competitions. They also produce a journal and a newsletter six times a year as well as publishing books.
Journal: The GB Journal
The GB Overprints Society
About: The GBOS helps members to explore the many ways and reasons why British stamps and other postal material have been overprinted, whether it is for use outside the UK or for special functions within the UK. They produce a journal four times a year, as well as holding collector presentations at shows such as Stampex.
Journal: The Overprinter
W. Reginald Bray
About: A website dedicated to the unusual postal activities of W. Reginald Bray
The R. M. Phillips Collection
About: The British Postal Museum and Archive holds the fantastic collection of R. M. Phillips and they have it digitised in its entirety on their website. It includes much unique material for the Jubilee issue including hand painted essays, die proofs, colour trials, etc.