API SPEC Q1 + ERTA + ERTA 2 + ADD 1 + ADD 2:2013
Specification for Quality Management System Requirements for Manufacturing Organizations for the Petroleum and Natural Gas Industry, Ninth Edition, Includes Errata (February 2014), Errata 2 (March 2014), Addendum 1 (June 2016) and 2 (June 2018) (Addendums Available in English Only)
