http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Peter P. Schoderbek, Charles G. Schoderbek, Asterios G. Kefalas.
Revised edition of: Management systems / Charles G. Schoderbek, Peter P. Schoderbek, Asterios G. Kefalas. Rev. edition 1980.