APA
Zemke R, Zemke R. & Connellan T, . (2000). E-Service. : AMACOM.
Chicago
Zemke R, Zemke R. & Connellan T, . 2000. E-Service. : AMACOM.
Harvard
Zemke R, Zemke R. & Connellan T, . (2000). E-Service. : AMACOM.
MLA
Zemke R, Zemke R. & Connellan T, . E-Service. : AMACOM. 2000.
