APA (7th ed.) Citation

(2008). Peter Piper's Practical Principles of Plain and Perfect Pronunciation. Project Gutenberg.

Chicago Style (17th ed.) Citation

Peter Piper's Practical Principles of Plain and Perfect Pronunciation. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Peter Piper's Practical Principles of Plain and Perfect Pronunciation. Project Gutenberg, 2008.

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