The Opera Goer's Complete Guide, 1921 version.

The Opera Goer's Complete Guide by Leo Melitz, 1921 version.

Melitz, Leo, The Opera Goer's Complete Guide, 1921 version, source of the plot.

Melitz, Leo (1913) The Opera Goer's Complete Guide.

Melitz, Leo, The Opera Goer's Complete Guide, 1921: source of synopsis with updates, clarifications, and modifications to its often out-of-date language.

The Opera Goer's Complete Guide, 1921 on books.google.com.

The Opera Goer's Complete Guide (Translated by Richard Salinger).

Melitz, Leo, opera synopsis in The Opera Goer's Complete Guide, 1921 version.

The Opera Goer's Complete Guide (translated by Richard Sanger.

Melitz, Leo (1921) The Opera Goer's Complete Guide, source for plot summary given here.