Cita APA (7th ed.)

Leffingwell, W. (1975). Text book of office management (3rd.). McGraw Hill.

Cita Chicago (17th ed.)

Leffingwell, W. Text Book of Office Management. 3rd. New Delhi: McGraw Hill, 1975.

Cita MLA (9th ed.)

Leffingwell, W. Text Book of Office Management. 3rd. McGraw Hill, 1975.