Cita APA (7th ed.)

Heyel, C. (1969). Computers, office machines etc. Macmillan.

Cita Chicago (17th ed.)

Heyel, Carl. Computers, Office Machines Etc. London: Macmillan, 1969.

Cita MLA (9th ed.)

Heyel, Carl. Computers, Office Machines Etc. Macmillan, 1969.