http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Foreword by George N. Shuster. A Montessori bibliography of materials in the English language, 1909-1961,
"A Montessori bibliography of materials in the English language, 1909-1961, compiled by Gilbert E. Donahue."