APA (7th ed.) Citation

Walling, W. E. (2007). Socialism As It Is A Survey of The World-Wide Revolutionary Movement. Project Gutenberg.

Chicago Style (17th ed.) Citation

Walling, William English. Socialism As It Is A Survey of The World-Wide Revolutionary Movement. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Walling, William English. Socialism As It Is A Survey of The World-Wide Revolutionary Movement. Project Gutenberg, 2007.

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