Μητροπολιτική Όπερα (εταιρεία): Διαφορά μεταξύ των αναθεωρήσεων

Διάσωση 1 πηγών και υποβολή 0 για αρχειοθέτηση.) #IABot (v2.0.8
(Διάσωση 1 πηγών και υποβολή 0 για αρχειοθέτηση.) #IABot (v2.0.8)
==Πηγές==
* {{cite book
| last = Krehbiel | first = Henry Edward | author-link = Henry Edward Krehbiel
|first = Henry Edward
| year = 1911
|author-link = Henry Edward Krehbiel
| title = Chapters of Opera
|year = 1911
| publisher = [[Project Gutenberg]]
|title | title = Chapters of Opera
| url = http://www.gutenberg.net/etext/5995|ref=none
|publisher | publisher = [[Project Gutenberg]]
}}
|url | url = http://www.gutenberg.net/etext/5995|ref=none
|ref = none
|access-date = 2021-02-28
|archive-date = 2004-10-09
|archive-url = https://web.archive.org/web/20041009124539/http://www.gutenberg.net/etext/5995
|url-status = dead
}}
* {{cite book
| last = Meyer | first = Martin
160.942

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