The Chain goes both ways - this has been fun
Well, of course, you can't refer to two things as a Singular, you'd have to use a Pluralisation.
The only thing is, it is certainly referring to the Rules Reference and the Learn to Play ... If only there was a booklet that had the words Rules Reference in it... Because as far as I can tell, the Corellian Conflict Campaign Guide shares none of those words in Common.
Indeed. The Corellian Conflict Campaign Guide must not be a Rules Reference Guide.
It does contain some Rules that are to be adhered to in the same, way, and it prefaces that in itself with:
"The Corellian Conflict Campaign Expansion introduces new rules for all modes of play (including campaigns and standard play). These rules are presented here."
These rules include sub headings that are:
New Squadron cards and Objective Cards
Short Player Edges Setup
Dust Fields
"-" Armament
Attacking Stations
and then we're done with the Rules for Standard and Crossover play. These could be argued as addenums to the Rules Reference themselves (much as the same way that the Contain Token is presented to us through Handouts in the Large Ships, Arquitens and Interdictor boxes) - but they themselves do not become part of the Rules Reference Guide. They are accepted as rules in Tournaments through the "official FFG publications" status they gain by being, well, official FFG Publications.
TL;DR - Nice try, and its been fun, but I'm claiming Rules-Fu Win here, since again, I don't have to rewrite english or place additional meaning behind words