APA
Cooperman S. H., . (1992). Professional office procedures. Regent/prentice hall, New Jersey: .
Chicago
Cooperman S H, . 1992. Professional office procedures. Regent/prentice hall, New Jersey: .
Harvard
Cooperman S. H., . (1992). Professional office procedures. Regent/prentice hall, New Jersey: .
MLA
Cooperman S H, . Professional office procedures. Regent/prentice hall, New Jersey: . 1992.