This is not legal advice, because it depends on a lot of information that is missing, but just to give you a general understanding:
Citing/referring to the source of the information does not mean it is ok for you to use that information - even if the information is "public". If I leave my car out in a public parking lot, it is still mine and leaving it there doesn't mean that you can use it. The same applies to me putting something on the internet. Even if it's public (like on Google), doesn't mean I am allowing you to use it. Each piece of information (statistics, pictures, music...) is owned by someone, and either they offer a license which tells you how you can/can't use it, or you have to contact them and get their explicit permission.

I am a mentor on Startups.com, an international lecturer on entrepreneurship and negotiation, and a commercial startup lawyer. I've successfully helped over 400 entrepreneurs, startups and businesses and I would be happy to help you. When scheduling a call, please send me some background information and the 2 main questions you want answered so that I can prepare in advance (to give you maximum value for your money). My reviews: https://clarity.fm/assafben-david