Bukowski, R.
, Fleming, R.
, Tubbs, J.
, Marrion, C.
, Dirksen, J.
, Duke, C.
, Prince, D.
, Richardson, L.
, Beste, D.
and Stanlaske, D.
(2006),
Elevator Controls., NFPA Journal, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=101171
(Accessed December 10, 2024)