APA
Sheppard E., Barnes T. J., . (2003). Companion to ecnomic geography. U.K: Blackwell Publishing.
Chicago
Sheppard Eric, Barnes Trevor J, . 2003. Companion to ecnomic geography. U.K: Blackwell Publishing.
Harvard
Sheppard E., Barnes T. J., . (2003). Companion to ecnomic geography. U.K: Blackwell Publishing.
MLA
Sheppard Eric, Barnes Trevor J, . Companion to ecnomic geography. U.K: Blackwell Publishing. 2003.