Wright, J. D., & Mattingly, G. E. (1998). NIST calibration services for gas flow meters: Piston prover and bell prover gas flow facilities. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিWright, John D., এবং G. E. Mattingly. NIST Calibration Services for Gas Flow Meters: Piston Prover and Bell Prover Gas Flow Facilities. [Gaithersburg, Md.]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1998.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিWright, John D., এবং G. E. Mattingly. NIST Calibration Services for Gas Flow Meters: Piston Prover and Bell Prover Gas Flow Facilities. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1998.