APA (7th ed.) Citation

Cox, M. G., Harris, P. M., & Smith, I. M. (2008). Software for GUM: Supplement 1: user manual. National Physical Laboratory.

Chicago Style (17th ed.) Citation

Cox, M. G., P. M. Harris, and I. M. Smith. Software for GUM: Supplement 1: User Manual. Teddington, Middlesex: National Physical Laboratory, 2008.

MLA (9th ed.) Citation

Cox, M. G., et al. Software for GUM: Supplement 1: User Manual. National Physical Laboratory, 2008.