I am a firm believer in using physical books, from the paperbacks that cost less than $10 each, all the way up to the Hardcovers that function as in-depth references
I also collect and use the various Military manuals and publications and declassified reports, I have found the Official sources help a lot of the time when it comes to breaking the "tie of mistakes" made in books
for example, I have around 25 Phantom books of the nearly 40 available, and the actual USN SACs work just great for deciding which author is easier to trust when they disagree
you only have to read that the Bicentennial USN Phantom was an F-4S or F-4B once or twice before you start to question "resources" that don't know either an F-4J BuNo or the start date of the F-4S program
if you use only the internet, you might possibly become an "F-4S believer",,,,,,,,,,the reverse is also true,,,,,,if you use only one Phantom book, and pick out the newest USN book,,,,,,,,you might believe that VF-11 and VF-111 had continuous histories (the Double Ugly USN book got those wrong)
so, just like our college professors told us,,,,,,,,we need to use different sources to find the overall picture