APA (7th ed.) Citation

Lippmann, W. (2006). A Preface to Politics. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lippmann, Walter. A Preface to Politics. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Lippmann, Walter. A Preface to Politics. Project Gutenberg, 2006.

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