Predmet 730/79 Phillip Morris ECLI:EU:C:1980:209, točka 11.
Amazon Final Transcripts [prvý viceprezident Worldwide Application Software, bývalý viceprezident/generálny riaditeľ North America Media and Video], 21. novembra 2014, bod 4633: 4 – 17: „A technical program manager typically comes from a technical background. […] They oftentimes were software development engineers and in some cases still wrote software actively.