APA

Faison C., Parris R., Rasberry S., Estados Unidos. National Institute of Standards and Technology^pUS, Estados Unidos. National Voluntary Laboratory Accreditation Program & Estados Unidos. National Voluntary Laboratory Accreditation Program. (1999). Chemical calibration: providers of proficiency testing. [s.l.]: NIST.

Chicago

Faison C.D, Parris R.M, Rasberry S.D, Estados Unidos. National Institute of Standards and Technology^pUS, Estados Unidos. National Voluntary Laboratory Accreditation Program and Estados Unidos. National Voluntary Laboratory Accreditation Program. 1999. Chemical calibration: providers of proficiency testing. [s.l.]: NIST.

Harvard

Faison C., Parris R., Rasberry S., Estados Unidos. National Institute of Standards and Technology^pUS, Estados Unidos. National Voluntary Laboratory Accreditation Program and Estados Unidos. National Voluntary Laboratory Accreditation Program. (1999). Chemical calibration: providers of proficiency testing. [s.l.]: NIST.

MLA

Faison C.D, Parris R.M, Rasberry S.D, Estados Unidos. National Institute of Standards and Technology^pUS, Estados Unidos. National Voluntary Laboratory Accreditation Program and Estados Unidos. National Voluntary Laboratory Accreditation Program. Chemical calibration: providers of proficiency testing. [s.l.]: NIST. 1999.