APA Style

al., M, R, M, E. (2007). Britannica Student Encyclopedia - Volume 15: W-X-Y-Z . United States America: Encyclopedia Britannica, Inc..

MLA Style

al., Mary, Rose, McCudden,, Et. "Britannica Student Encyclopedia - Volume 15: W-X-Y-Z". United States America: Encyclopedia Britannica, Inc., 2007. Text.