{"source":"book","style":"apa","contributors": [{"function":"author","last":"Verdi","first":"Giuseppe"},{"function":"author","last":"Piave","first":"Francesco","middle":"Maria,"},{"function":"author","last":"Maffei","first":"Andrea"},{"function":"author","last":"Ducloux","first":"Walter"},{"function":"author","last":"Shakespeare","first":"William"} ],"pubtype": {"main": "pubnonperiodical"},"pubnonperiodical": {"title":"Macbeth : opera in four acts","publisher":"G. Schirmer","city":"New York","year":"1961"},"datasource":"/z-wcorg/","datasource":"http://www.worldcat.org","oclc":"12783875"}