wow, Matt you read my mind! I was searching like crazy for topics about this last night and was going to post this same question. I was going to post about just books in general that explain costs of business, business planning and strategy, anything to further knowledge.
Ive looked through book stores, but theres nothing about business in lawn care or green industry that i have found. The one book i bought was building a business plan which was published by socrates. It goes fairly in depth on what a business plan should consist of any things you need to analyze and so forth.
I built an excel spreadsheet concerning the cost of doing business sometime back. If you do a search you'll probably find a thread with the spreadsheet in it. You could use that as a template to work from, or at least get some ideas from. I had factored in variable costs - such as fuel, maintance, etc., and fixed costs - such as phone, advertising, equipment and depreciation, etc. The worksheet broke it down to a per-hour cost of doing business based on expected hours of work for the season.
Matt, if you can teach yourself fairly well, go to your local college campus and look around for a managerial or cost accounting book. This time of year, students are selling back their books and if you catch them before they sell them back you could offer them a couple dollars more than the book store and you both come out ahead.
It certanly will not be industry specific but you will get solid info that can be applied to any industry.