The literature on the history of intelligence in general, and military intelligence in particular, is scattered across dozens of specialist subfields, in many languages. Fortunately, one strength of the field is works of bibliography, which guide the assiduous student toward works of relevance. In terms of chronological coverage, from the classical to contemporary periods, students are well served by Sheldon 2002 , Calder 1999 , and Clark’s The Literature of Intelligence . Constantinides 1983 retains value, but is somewhat dated. Sexton 1996 and Shulman 1976 offer good if dated bibliographies on one key area, signals intelligence. West 2010 points to works on naval intelligence, while Whaley 2007 is a masterful compilation of works on deception. Polmar and Allen 2004 is a useful encyclopedia, for general reference.
Surveillant /3 says Ferris "demonstrates that signals intelligence influenced the operations of the British Army as much as those of the Royal Navy." According to Bennett , I&NS , this book is based on the "records of 1917 and 1918 which Dr. Ferris has so discriminatingly selected and so scrupulously edited"; it is "likely to be recognized as a seminal work." Peake , AIJ /90, suggests that the documents included here, "coupled with [Ferris'] Introduction, well annotated end notes, and a very helpful bibliographic essay,... will be of great value to those interested in the subject."