Citazione Stile APA (7a Edizione)

Aldrich, R. (1905). A guide to The ring of the Nibelung: The trilogy of Richard Wagner, its origin, story, and music. Oliver Ditson company.

Citazione stile Chigago Style (17a edizione)

Aldrich, Richard. A Guide to The Ring of the Nibelung: The Trilogy of Richard Wagner, Its Origin, Story, and Music. Boston: Oliver Ditson company, 1905.

Citatione MLA (9a ed.)

Aldrich, Richard. A Guide to The Ring of the Nibelung: The Trilogy of Richard Wagner, Its Origin, Story, and Music. Oliver Ditson company, 1905.