in reference to

[in reference to] or [with reference to] or [in regard to ] or[with regard to] {prep.} In connection with; from the standpoint of;concerning; regarding; about.

I am writing with reference to yourlast letter.

He spoke in reference to the Boy Scouts.

I spoketo him with regard to his low marks.

In regard to the testtomorrow, it is postponed.

Compare: IN RELATION TO, IN RESPECT TO.