In a static model, considering interest rate is not necessary, as it is a snapshot in time. In a dynamic model, it depends on the error one wants to accept and on the interest rate, or how far is it above inflation. For just a couple of years, say, up to 5 years, it could be neglected. On a horizont of 30 years, it has to be taken into account (unless it is guaranteed zero over the entire period). Between the two values, it depends on the situation and on the purpose of the model.
As a first source, I would suggest Wikipedia:
http://en.wikipedia.org/wiki/Interest_rate
For more information, any book on macroeconomics will do.
From the enterprise point of view, I would recommend Richard A. Brealey, Principles of Corporate Finance, McGraw-Hill, ISBN 978-0071266758. It's not because it would be the best but it's the first one on my bookself.
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