Cita APA (7th ed.)

Gregory, R. H. (1963). Automatic data-processing systems: Principles and procedures (2nd ed.). Chatto and Windus.

Cita Chicago (17th ed.)

Gregory, Robert H. Automatic Data-processing Systems: Principles and Procedures. 2nd ed. London: Chatto and Windus, 1963.

Cita MLA (9th ed.)

Gregory, Robert H. Automatic Data-processing Systems: Principles and Procedures. 2nd ed. Chatto and Windus, 1963.