code: public java.util.List<AccountAggregationSource> getAccountAggregationSources() {
          if (accountAggregationSources == null) {
              accountAggregationSources = new com.amazonaws.internal.SdkInternalList<AccountAggregationSource>();
          }
          return accountAggregationSources;
      }
docs: <p>
  Provides a list of source accounts and regions to be aggregated.
  </p>
  
  @return Provides a list of source accounts and regions to be aggregated.