http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Service-learning and community service in K-12 public schools
Service learning and community service in K-12 public schools
National Center for Education Statistics
authors: Rebecca Skinner, Chris Chapman.
Includes bibliographical references (pages 15-16).
Statistics in brief (National Center for Education Statistics)