See these reports and background information on the May 4 referendum in Santa Cruz, Bolivia:

Radio reports/interviews on May 4 Referendum in Santa Cruz

Santa Cruz's Referendum, Bolivia's Choice by John Crabtree

Illegal Autonomy Referendum Deepens Division in Bolivia by the Andean Information Network

Right Wing Revolt Threatens Bolivia by Fred Fuentes

The Dark Side of Bolivia's Half Moon by Benjamin Dangl

Fear and Loathing in Bolivia: New Constitution, Polarization by Benjamin Dangl

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For more in English related to the May 4th referendum, see:

Upside Down World Bolivia Watch Page

Andean Information Network

Bolivia Rising

Democracy Center