in/with reference to

in reference to someone or something

 and with reference to someone or something concerning or about someone or something;
in connection with someone or something. What shall we do in reference to Bill and his problem? With reference to what problem?
See also: reference
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

with reference to

Also, with regard or respect to . See in regard to.
See also: reference
The American Heritage® Dictionary of Idioms by Christine Ammer.

in/with ˈreference to

(formal or written) used to say what you are talking or writing about: With reference to your letter of July 22...
See also: reference
Farlex Partner Idioms Dictionary
See also:
  • in reference to
  • in reference to (someone or something)
  • reference
  • peg-leg
  • money, winning, etc. isn't everything
  • (something) isn't everything
  • Say it ain't so, Joe
  • Say it ain't so, Joe!
  • rivet counter
  • do not pass Go, do not collect $200