'official reference' is correct and can be used in written English.
You would use it when you need to refer to something (such as a document) which has been officially approved or endorsed by a relevant authority. For example, "The official reference for this policy is document number 1234."
Earlier this year, a rare official reference to his whereabouts described him as "working in Urumqi".
However Apple's source for its misleading data is unimpeachable: the gazetteer is the official reference.
Well, you will not find it in the Diagnostic and Statistical Manual of Mental Disorders-IV, the official reference of the American Psychiatric Association.
The first official reference to the attack is a short information report by a Transfield client services officer, just before 6.30pm in May 2015.
A treasury paper in 2009, obtained by the Guardian, identifies a "squeezed middle" facing stagnant or falling wages since 2004 – believed to be the first official reference to the phenomenon.
In the 1970's, Czeslaw knew that the Soviet authorities in Poland were beginning to rehabilitate his reputation when an official reference work alluded to him -- unmistakably, though not by name -- as one of several poets in his generation who were of no particular significance.
In an official character reference, the lieutenant wrote that Specialist Hernandez's "hard work and leadership capabilities easily make him one of the best paratroopers in the platoon".
· Consider parting with a small amount of cash to use vetted contacts who have undergone police checks and provide official references, like those on yoursafeplanet.com.
But as the Supreme Court has recognized, the country's history "is replete with official references to the value and invocation of Divine guidance in deliberations".
Often, official references to those doing the killing go no further than "unknown persons," leaving their identity — agents provocateurs, business rivals or guerrillas — the stuff of conspiracy theories.
Consider the following: Apart from a few important exceptions — like the history textbooks — positive official references to Stalin have been rare since the collapse of the Soviet Union.
