Forum:SH:Policy for references to Legends content?

Having recently read the new Tarkin novel by James Luceno, I noticed several instances where he appeared to be directly referencing content from previous Legends entries. For example he mentions the instability on Ansion, presumably referring to the events of The Approaching Storm as well as a mention of one of Vader's first missions, "an execution" on Murkhana, seemingly that which occurred in Dark Lord: The Rise of Darth Vader. Now I can see how these would still be too obscure to warrant bringing that content under the Canon banner, but I was wondering if there is any policy set in place for deciding the degree to which Legends content must be cited before it can be accepted as canon. JethLordMaster  (Xia Order) 21:32, November 11, 2014 (UTC)