Data referencing will not show the labels. You can do an xref or copy your labels from the other drawing, see this thread.
Civil 3D 2013 SP1
Win 7 x64 SP1
Intel Core2 Duo 2.67 GHz
8 GB RAM
NVIDIA Quadro FX 3500
The way our office does it is label the contours in one drawing and also create a data reference of the surface. In all of the other drawings XREF in the 'image' of the labeled contours and data reference the surface, set this data referenced surface to a "No Display" style.
Co-author of "Mastering AutoCAD Civil 3D 2013"
AutoCAD Civil 3D 2013 Certified Professional and AutoCAD 2013 Certified Professional
AU2012 Speaker::: CI3001: Reverse Engineering with Subassembly Composer for AutoCAD Civil 3D
AU2011 Speaker::: CI4252: Create Subassemblies That Think Outside the Box With Subassembly Composer for AutoCAD® Civil 3D®
You can have both the x-ref and the datalink in the same drawing so why not use both?
Civil 3D x64 2012
Win 7 x64 Ultimate
I7 3820 (3.6ghz quad core with HT)
32gig RAM (Corsair XMS3 4x8g)
Intel x z79 mobo (BOXDX79TO 2011 socket)
Radeon HD 7850 2gb GDDR5