When I voted Leave, I understood that there was an economic downside. I think staying in the EU also has an economic downside, particularly if the Eurozone continues to underperform. Personally, I think the sovereignty issue is more important but I understand that others disagree.
I agree that the fall in the Pound will, if nothing else happens, cause a rise prices. This happens because the price of things we import translate into more pounds. Conversely, the things we export are cheaper in foreign currency, adding a stimulus to exports and helping to counter an increase in foreign tariffs, should that occur. Many economists (although, sadly, not the architects of the Euro) see the value of a floating exchange rate to help an economy to adjust to exogenous shocks.
There is also a question whether downward pressure on real wage rates would be eased by a slower flow of people from the EU looking for work in the UK. The Bank of England cited net migration as one source of downward pressure on real wage rates in recent years. Whether this would reverse in future is possible but not certain, especially if the UK economy turns down. The increasing use of robots rather than labour over the longer term adds additional doubt, in or out of the EU.
I am not the authoritative source requested but there are a few things that might help us muddle through rather than fall off a cliff.