APA (7th ed.) Citation

Fetter, F. A. (2012). The Principles of Economics With Applications to Practical Problems. Project Gutenberg.

Chicago Style (17th ed.) Citation

Fetter, Frank A. The Principles of Economics With Applications to Practical Problems. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Fetter, Frank A. The Principles of Economics With Applications to Practical Problems. Project Gutenberg, 2012.

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