HI Larissa,
Do you mean the Reference created on a mirror Contract?
You can use those transactions to process reference:
Create Reference (TBR6),
Change Reference (TBR7),
Display Reference (TBR8),
Reverse Reference (TBR9).
The transaction TBRL, gives you an overview of all references which meet the selection criteria you enter.
Just select the category MIR
In the contract, you can access an overview of the references associated with a financial transaction via Environment > Object links
http://help.sap.com/saphelp_sfin100/helpdata/en/3f/14da531198434de10000000a174cb4/frameset.htm
If you need the tables are those mentioned by Feng, There are also the function bellow that could help
FUNCTION tb_ref_objects_get
Best