Most likely, if the business is located in Pennsylvania, then yes, any income earned from them is considered to be from PA sources.
As a nonresident, you would need to file a nonresident state tax return to report the income from PA, but you will also be able to claim a credit for taxes paid to PA on your resident state return. This eliminates the issue of double taxation as you will receive a credit on your resident state tax return for the income also taxed in PA.
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