How do I determine if investment income is from a NJ source

I am filing a NJ non-resident form because I had some salary income from NJ for part of January 2016. I also had dividend income from a Vanguard NJ Tax exempt fund. Turbo tax is asking me how much of that dividend income is from NJ sources - the Fund is managed by vanguard, but the investment is in NJ government bonds. The only thing I can see at the NJ state tax site talks about income derived from property or businesses in NJ. Is the dividend income considered from a New Jersey Source?

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Not for your purposes. If you opened a savings account while you were in New Jersey, the interest that account earned would be New Jersey source investment income.