Mormon references his original source without citing it. He is point to the following:
3 Nephi 14:11
11 If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father who is in heaven give good things to them that ask him?
The connection if obvious, but it is not a direct citation. What we have is Mormon creating sufficient reference that the source is recognized, but keeping his discourse in the looser mode of a paraphrase where he can more easily mold the model texts to his current purpose.