Small Time Operator: How to Start Your Own Business, Keep Your Books, Pay Your Taxes, and Stay Out of Trouble (Bernard Kamoroff CPA)
I consider this book to be my Bible when it comes to creating and running a small business. I've read through it multiple times at different phases in my life and each time I learn something new and worthwhile. It is my go-to reference tool when I have questions about financials, taxes, legalities, hiring/firing, and everything in between. I highly recommend this for anyone who is considering starting their own small business, or anyone who wants to make sure their existing small business is on the up and up.