APA (7th ed.) Citation

Erichsen, H. (2010). Methods of Authors. Project Gutenberg.

Chicago Style (17th ed.) Citation

Erichsen, Hugo. Methods of Authors. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Erichsen, Hugo. Methods of Authors. Project Gutenberg, 2010.

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