What are acceptable "relationships with referees"? I am applying for a job and need to give referees, and their relationship with me. I am not sure how to phrase things. My referees are:


A colleague in my department I publish with
A previous boss in another university I still publish with
Senior people in my field who I have not published with (yet)


None of those things seem formal enough! Is there standard phrases I should be using?
Perhaps:


Colleague from current university and active collaborator
Former employer and active collaborator
Respected senior colleague from same field