APA (7th ed.) Citation

Gregory, R. H., & Van Horn, R. L. (1963). Automatic data-processing systems: Principles and procedures (2nd edn.). Chatto and Windus.

Chicago Style (17th ed.) Citation

Gregory, Robert H., and Richard L. Van Horn. Automatic Data-processing Systems: Principles and Procedures. 2nd edn. London: Chatto and Windus, 1963.

MLA (8th ed.) Citation

Gregory, Robert H., and Richard L. Van Horn. Automatic Data-processing Systems: Principles and Procedures. 2nd edn. Chatto and Windus, 1963.