code: public void addReference(String referenceSource, String referenceName, String referenceUrl) {
          final Reference ref = new Reference();
          ref.setSource(referenceSource);
          ref.setName(referenceName);
          ref.setUrl(referenceUrl);
          this.references.add(ref);
      }
docs: Adds a reference.
  
  @param referenceSource the source of the reference
  @param referenceName the referenceName of the reference
  @param referenceUrl the url of the reference