APA (7th ed.) Citation

Paine, A. B. The Boys' Life of Mark Twain.

Chicago Style (17th ed.) Citation

Paine, Albert Bigelow. The Boys' Life of Mark Twain.

MLA (9th ed.) Citation

Paine, Albert Bigelow. The Boys' Life of Mark Twain.

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