APA

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

Chicago

Schweikart L, Birzer B.J, . 2003. The American West. New York: John Wiley & Sons, Ins.

Harvard

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

MLA

Schweikart L, Birzer B.J, . The American West. New York: John Wiley & Sons, Ins. 2003.