APA (7th ed.) Citation

Guerber, H. A. (2005). Stories of the Wagner Opera. Project Gutenberg.

Chicago Style (17th ed.) Citation

Guerber, H. A. Stories of the Wagner Opera. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Guerber, H. A. Stories of the Wagner Opera. Project Gutenberg, 2005.

Warning: These citations may not always be 100% accurate.