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Dear Ken,
Are you concerned with formal sampling or are you just concerned to devise 
an appropriate research strategy?
If the former you might look at what Erickson and Nosanchuk did.
Erickson, B. H. and T. A. Nosanchuk (1983). "Applied network sampling." Social 
Networks 5(4): 367-382.

If you are thinking about a broader research strategy you might find it useful 
to see what Doreian and Woodward did with expanding selection.
Doreian, P. and K. L. Woodard (1994). "Defining and locating cores and 
boundaries of social networks." Social Networks 16(4): 267-293.
Cheers, Malcolm.

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