The seminal book on the strategy, 30-Day Stay, published here on BiggerPockets and written by MTR pioneering investors Sarah Weaver and Zeona McIntyre, has helped popularize the method.

It should all be published / public information. 

Apparently Brad did email comments for this article, but I didn't really see anything that wasn't already published elsewhere.

This amount is fully refundable for any reason if you do not execute a loan commitment with us and you request in writing within thirty(30) days of the date of this letter the return of the $10,000.signing of the loan commitment, a commitment fee equal to five percent (5%) of the Financing Request is due; three percent (3%) would be payable at the signing, and the remainder would be payable from the loan proceeds at closing.

Take a look at BP's blog where new articles are published every day: https://www.biggerpockets.com/blog4.

Take a look at BP's blog where new articles are published every day: https://www.biggerpockets.com/blog4.

Also check out this article published last year on BP on this exact topic/question - hope it helps!

I have read a lot of books published by bigger pockets and other authors on real estate investing.

Be sure and read @Avery Carl's book, Short Term Rental, Long Term Wealth, published by BP. 

Within fourteen days, excluding Saturdays, Sundays or other legal holidays, after termination of the tenancy and delivery of possession and demand by the tenant the landlord shall provide the tenant an itemized list of all deductions together with the amount due and payable to the tenant, if any.