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*[https://archive.org/details/secretcorpstaleo00tuohuoft ''The Secret Corps : a Tale of "Intelligence" on all Fronts''] by Captain Ferdinand Tuohy 1920 Archive.org. Also see a [[ Western Front#Post War including British Occupation of Germany|postwar book below]]. The author was/became a news reporter and post-war foreign correspondent. *[https://digitallib.stou.ac.th/handle/6625047444/1704 ''Detective & Secret Service Days'' ] by Edwin T Woodhall 1929. Link to a pdf download, STOU Digital Repository Sukhothai Thammathirat Open University, Thailand. Note, this website has been noticed to be unavailable at times, possibly it may only be accessible during "office hours". Extracts from the book: [https://web.archive.org/web/20180804131912/https://pixelsurgery.files.wordpress.com/2017/10/edwin-wood-hall-detective-part-1.pdf "Book I" pages 31-122], [https://web.archive.org/web/20180804131357/https://pixelsurgery.files.wordpress.com/2017/10/toplis-sectret-service-days.pdf "Book II Secret Service Days", pages 125-162], of 282 pages in total. Archive.org. The 1937 edition was titled ''Detective and Secret Service Days''. The author chronicles his experiences beginning briefly with his early days in 1906 in the London Metropolitan Police Force, and then on to when he subsequently became attached to the CID at Scotland Yard, the Special Political Department, the Secret Service Department and the Special Central Department. [http://www.casebook.org/dissertations/rip-woodhall.html Details of the author] casebook.org. Elsewhere it is stated that Chapter III "Military Ishmaels", page 143 is about Toplis who is discussed in an article,<ref>[https://pixelsurgery.wordpress.com/2017/10/27/secret-service-days-woodhall/ "Monocled Mutineer, Percy Toplis"] pixelsurgery.com</ref> and that Chapter IV, "A Charming Spy", relates to Mata Hari, see below. He was also the author of ''Spies of the Great War : adventures with the Allied Secret Service'' by Edwin T. Woodhall 1932.