APA (7th ed.) Citation

Gregory, R. H., & Van Horn, R. L. (1963). Business data processing & programming. Wadsworth Publ..

Chicago Style (17th ed.) Citation

Gregory, Robert H., and Richard L. Van Horn. Business Data Processing & Programming. Belmont, Calif: Wadsworth Publ., 1963.

MLA (9th ed.) Citation

Gregory, Robert H., and Richard L. Van Horn. Business Data Processing & Programming. Wadsworth Publ., 1963.