The Referee Book - IAAF
The title is misleading - this book is for all officials, not just for referees.
The initial introduction deals with the role of IAAF officials and the organisation of the meetings.
Once into specific chapters it deals with where to site judges on the track, all the rules covering lanes and seeding, steeplechase and relays.
The field section deals with general aspects and each event is covered in detail with siting of officials (assuming you have enough!).
The book is more detailed than the UKA officials books (judging field events 3rd edn.).
If looking at becoming level 4 then this is a must read but it is of use to level 3 as well.
- 14th edition, 2016