https://classicspeakerpages.net/library/acoustic_research/ar-9_series_1978-1981/ar-9_series_manuals/ar-9_manual/ar-9_manual_pg27.html
AR-9 Manual pg27 | The Classic Speaker Pages
the classicarmanualspeakerpages
https://londonsafeguardingchildrenprocedures.co.uk/chapter/pg27-interpreters-communication-facilitators
PG27. Interpreters / Communication Facilitators
interpreterscommunicationfacilitators