Membership of the 112th Congress : A Profile.
MLA
Library of Congress. Membership of the 112th Congress : A Profile. [Place of publication not identified] : [publisher not identified], 2012.
APA
Library of Congress. (2012). Membership of the 112th Congress : A Profile. [Place of publication not identified] : [publisher not identified].
Chicago
Library of Congress. Membership of the 112th Congress : A Profile. [Place of publication not identified] : [publisher not identified], 2012.