There are 2 samples in the path:
fabric/ folder examples/chaincode/go/chaincode_example04 examples/chaincode/go/chaincode_example05
These samples might help you.
Both of them invoke chaincode_example02. The only difference between them is that chaincode_example04 hardcodes chaincode_example02's ID and chaincode_exampl05 gets the ID from an argument.
At the present time, one cannot reference chaincode by name (except in "dev" mode).