code: public static
              CitationType
              convert(
                      org.openbel.framework.common.enums.CitationType objCitationType) {
          if (objCitationType == null) {
              return null;
          }
          switch (objCitationType) {
          case BOOK:
              return CitationType.BOOK;
          case JOURNAL:
              return CitationType.JOURNAL;
          case ONLINE_RESOURCE:
              return CitationType.ONLINE_RESOURCE;
          case OTHER:
              return CitationType.OTHER;
          case PUBMED:
              return CitationType.PUBMED;
          default:
              return null;
          }
      }
docs: Converts {@link org.openbel.framework.common.enums.CitationType} to
  {@link CitationType}.
  
  @param objCitationType Citation type
  @return {@link CitationType}; may be null