APA (7th ed.) Citation

Buehler, H. G. (2004). Practical Exercises in English. Project Gutenberg.

Chicago Style (17th ed.) Citation

Buehler, Huber Gray. Practical Exercises in English. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Buehler, Huber Gray. Practical Exercises in English. Project Gutenberg, 2004.

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