The 21 Irrefutable Laws of Leadership by John C. Maxwell sits on a lot of entrepreneurs' desks, and not by accident — it's the kind of book you keep within reach, not the kind you read once and put away.
Published in 1998, the book passed the million-copy mark in about ten years, which led Maxwell to release a revised edition in 2007 for its tenth anniversary: every chapter was reworked, two entirely new laws were added — including the Law of Addition, about how leaders add value by serving others rather than by accumulating power — and an extra decade of experience fed into the examples.
The first law, the Law of the Lid, sums up the spirit of the book in a single sentence: your leadership ability determines your level of effectiveness, period. No matter how strong your technical skills or how good your product is, if your ability to lead stays low, that — and only that — puts a lid on everything you can accomplish.
Other laws are well worth a look: the Law of Process (leadership develops daily, not in a day), the Law of Navigation (anyone can hold the wheel, but it takes a leader to chart the course), or the Law of Solid Ground (trust is the foundation everything else rests on — and once it cracks, almost nothing stays standing).
What sets this book apart from a theory manual is that Maxwell builds his 21 laws out of his own mistakes as much as his successes — he doesn't pretend he followed them all on the first try. It's not a one-evening read. It's more the kind of book you come back to one law at a time, depending on what you're wrestling with that week.