Developing strategy, relies on understanding the patterns evident in the mechanics of doing business, (startups and mature corps alike).
To that end, I strongly recommend Michael Porter, who literally wrote the book on modern "Competitive Strategy". There is no other single source of strategic theory that is better than this. Anybody that has taken a b-school class on strategy worth their tuition will recall concepts like Porter's 5-forces.
Other answers seem to offer more recently offered books and some might dare to argue his frameworks are dated but really it's in a robust, tried-and-true-kind of way. Other books that try to cover defining strategy, value chain, industry analysis are often derivative of his work.
If you don't end up reading it at least get a list of his key concepts and google the shit out of them. They all seem like a "duh, i knew that" on paper, but you should have these theories in your back pocket whenever you need to formulate a battleplan.
To that end, I strongly recommend Michael Porter, who literally wrote the book on modern "Competitive Strategy". There is no other single source of strategic theory that is better than this. Anybody that has taken a b-school class on strategy worth their tuition will recall concepts like Porter's 5-forces.
Other answers seem to offer more recently offered books and some might dare to argue his frameworks are dated but really it's in a robust, tried-and-true-kind of way. Other books that try to cover defining strategy, value chain, industry analysis are often derivative of his work.
If you don't end up reading it at least get a list of his key concepts and google the shit out of them. They all seem like a "duh, i knew that" on paper, but you should have these theories in your back pocket whenever you need to formulate a battleplan.
http://en.wikipedia.org/wiki/Porter_generic_strategies
http://www.amazon.com/Competitive-Strategy-Techniques-Indust...