@inbook{inbook, title  = {{Functional graphic representation: pictures and symbols.}},

 publisher = {{Europia}},

 url = {{}},

 year = {{1994}},

 month = {{10}},

 author = {{Martlew M and Sorsby AJ}},

 isbn = {{978-2909285023}},

 note = {{Accessed on 2024/12/29}}}