*Looking for a book about business English ***

Does anybody happen to know a book about business English writing?

I am always feeling panic when I write a formal invitation letter or a sublet contract, since I really have no idea what the formats they should have, and what terms or words I should use. I think I need some templates to learn business English writing such as: letter of condolence, letter of invitation, contracts, announcements, notices, certifications, minutes and agendas.

does anybody happen to know something about this kind of books(the book titles or key words of the titles are enough). I can search them on the Amazon.com.
Appreciate your kind helps.