APA (7th ed.) Citation

Camfield, G. (2003). The Oxford companion to Mark Twain. Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Camfield, Gregg. The Oxford Companion to Mark Twain. Oxford [u.a.]: Oxford Univ. Press, 2003.

MLA (9th ed.) Citation

Camfield, Gregg. The Oxford Companion to Mark Twain. Oxford Univ. Press, 2003.

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