Description: Citation for the source document. This element encodes the bibliographic information describing the source codebook, including title information, statement of responsibility, production and distribution information, series and version information, text of a preferred bibliographic citation, and notes (if any). Information for this section should be taken directly from the source document whenever possible. If additional information is obtained and entered in the elements within this section, the source of this information should be noted in the source attribute of the particular element tag. A MARCURI attribute is provided to link to the MARC record for this citation.