Goodish introduction, but too easy on the maths
A rather good introduction to the basic principles of microeconomics, but not to be used as a stand-alone university textbook.
As the name suggests, it comes at the subject from a managerial, corporate point of view (as opposed to eg welfare economic analysis).
A bit wordy at times, and severly lacking in mathematical rigour, this makes a good high school textbook, and a good introductory text at university level. If, that is, one adds some extra material to give some of the necessary mathematical tools.
If looking for only one book for self-study, I'd go straight for a book like Varians Intermediate Microeconomics. This book is - sadly - too weak on game theory and maths to use as a stand-alone university text.