APA
Gage S. M., . (2000). The agile manager's guide to extraordinary customer service. Velocity Business Publ., Bristol: .
Chicago
Gage Susan M, . 2000. The agile manager's guide to extraordinary customer service. Velocity Business Publ., Bristol: .
Harvard
Gage S. M., . (2000). The agile manager's guide to extraordinary customer service. Velocity Business Publ., Bristol: .
MLA
Gage Susan M, . The agile manager's guide to extraordinary customer service. Velocity Business Publ., Bristol: . 2000.