APA
Zikmund W. G., McLead.Gilbert, . (2004). Customer Relationship Management. New York: John Wiley & Sons.
Chicago
Zikmund William G, McLead.Gilbert, . 2004. Customer Relationship Management. New York: John Wiley & Sons.
Harvard
Zikmund W. G., McLead.Gilbert, . (2004). Customer Relationship Management. New York: John Wiley & Sons.
MLA
Zikmund William G, McLead.Gilbert, . Customer Relationship Management. New York: John Wiley & Sons. 2004.