"Boeing, Safran Agree to Design, Build and Service Auxiliary Power Units" (Press release). June 4, 2018. SafranArchived 2020-09-24 at the Wayback Machine, Boeing
"Boeing, Safran Agree to Design, Build and Service Auxiliary Power Units" (Press release). June 4, 2018. SafranArchived 2020-09-24 at the Wayback Machine, Boeing
"Boeing, Safran Agree to Design, Build and Service Auxiliary Power Units" (Press release). June 4, 2018. SafranArchived 2020-09-24 at the Wayback Machine, Boeing