http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
status of teaching as a profession, 1990-91 : SASS
National Center for Education Statistics
Richard M. Ingersoll ; Peggy Quinn and Sharon Bobbitt, project directors.
Includes bibliographical references (pages 45-50).
Statistical analysis report (National Center for Education Statistics)