Franklin

MLA

Gregory, Robert Henry, and Richard L Van Horn. Automatic Data-processing Systems: Principles and Procedures. 2d ed. Belmont, Calif.: Wadsworth Pub. Co., 1963.

APA

Gregory, R. Henry, & Van Horn, R. L. (1963). Automatic data-processing systems: principles and procedures. 2d ed. Belmont, Calif.: Wadsworth Pub. Co.

Chicago

Gregory, Robert Henry., and Richard L Van Horn. Automatic Data-Processing Systems: Principles and Procedures. 2d ed. Belmont, Calif.: Wadsworth Pub. Co., 1963.