Citing a Work that Cites a Personal Communication

There is a textbook which has tabular data that I would like to reference. The textbook cites the tabular data as being from a personal communication with another author. I see this as a quandary since:

(1) If I reference the textbook without the personal communication, I am not giving proper credit to the original author (even though they never published the data separately in its own right)

(2) If I reference the personal communication, this would be incorrect and perhaps fraudulent as it was not between myself and the author, I am only a third party, and I would not be giving proper credit to the textbook authors, which is how the data was published.

(3) If I reference both, that is somewhat awkward as that would imply that I found the data from both sources independently, even though I only found it in one.

What is the proper way to reference this?