Yep That one cant be ignored and if we are keeping to the original posters idea of presenting an Alien a few books to learn about the General Northern Soul Scene then its up right up there.The Books i would recommend and the ones that i really enjoyed reading are
Too Darn Soulful---David Nowell----Good overview of the scene and the Legendary venues
Casino--Dave Shaw---Brilliant emotional account of one mans casino experiences
Wigan Casino Years--Tim Brown---the ultimate casino book
Right Track--Rob Mckeever/Ginger Taylor---entertaining book from an entertaining DJ
Northern Soul Top 500--Kev Roberts---Nice well put together enjoyable book
Don't think you need to get any others really apart from as already mentioned the one Mr Searling needs to do,plus would really love to see Ian Dewhurst write all his great posts into one book.Also would love to see the record hunting book when it comes out