1. P.A. Beaumarchais, Le Marriage de Figaro (act 3, scene 16).
2. The kindness of strangers: the abandonment of children in Western Europe from late antiquity to the Renaissance;Boswell,1988
3. Antecedents of American adoption;Sokoloff,1993
4. Groups seeking to eliminate adoption;Duke,1999
5. East of Eden;Steinbeck,1968