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 your last letter.

He spoke in reference to the Boy Scouts.

I spoke to him with regard to his low marks.

In regard to the test tomorrow, it is postponed.

Compare: IN RELATION TO, IN RESPECT TO.