Lots of websites, books and archives are cited in the book itself, but in the meantime I would recommend:
Run by a fellow history nerd, Lee Jackson, this is an absolutely brilliant website filled with Victorian writing, musings, lists and everyday information. You can also follow him on twitter @VictorianLondon
The history of pretty much anywhere in Britain, substantial but searchable history books and directories online.
A great site dedicated to the newspaper editor and Inspector Minahan’s supporter, William T. Stead
An American site filled with British and US books from the period.
A great local history site run by an expert on Limerick family history. For all those searching Minahan’s roots or their own.
More – including a Pinterest page – to follow…