Professional trade journals such as Accountancy, Tax advisor and others. 

Not true, but don't believe me or anyone else, go find the answer from qualified tax professionals!

You should consult with your tax professional on the matter. 

I can generate some anecdotal examples, but would really like to see a professional study, existing court case, etc.

I played professional baseball for 4 years and don't have any experience in the real estate world.

Readers should seek professional advice.

Business to business is generally the highest paying avatar for us while also being the most professional.

Hi Jayvionne, Welcome to the community - There are a lot of good professionals and resources here on bigger pockets to learn and grow. 

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

You get to rent to professionals who are less likely to trash your property, you get to charge a higher rent than long term, and you're being paid by large, 3rd party companies that are extremely unlikely to not pay rent.