APA

Schweikart L, Birzer B, . (2003). The American West. New Jersey: John Wiley&Sons, Inc.

Chicago

Schweikart L, Birzer B, . 2003. The American West. New Jersey: John Wiley&Sons, Inc.

Harvard

Schweikart L, Birzer B, . (2003). The American West. New Jersey: John Wiley&Sons, Inc.

MLA

Schweikart L, Birzer B, . The American West. New Jersey: John Wiley&Sons, Inc. 2003.