Clara R. Burgert, Blake Zachary, and Josh Colston (2013) "Incorporating Geographic Information into Demographic and Health Surveys: A Field Guide to GPS Data Collection"
The GPS survey manual for Demographic and Health Surveys.
Yale Map Collection (200?) "GPS & GIS: Collecting Spatial Coordinates and Using them in ArcGIS"
This manual is more technical than the above.
UNICEF MICS surveys use Garmin eTrex 30. GPS data collection manuals are downloadable here.