What are good sources to learn about Bootstrap? I think that Bootstrap can be useful in my work, where we have a lot a variables that we don't know the distribution of it. So, simulations could help.
What are good sources to learn about Bootstrap/other useful simulation methods?
A classic book is by B. Efron who created the technique:


Bradley Efron; Robert Tibshirani (1994). An Introduction to the Bootstrap. Chapman &amp; Hall/CRC. ISBN 978-0-412-04231-7.