APA
Heyel C., . (1972). Handbook of modren office management and administrative servies. McGraw-Hill, New York: .
Chicago
Heyel Carl, . 1972. Handbook of modren office management and administrative servies. McGraw-Hill, New York: .
Harvard
Heyel C., . (1972). Handbook of modren office management and administrative servies. McGraw-Hill, New York: .
MLA
Heyel Carl, . Handbook of modren office management and administrative servies. McGraw-Hill, New York: . 1972.