The already mentioned "An Introduction to Genetic Algorithms" is one of the bests.
Maybe, if you are looking for a more practical approach: https://os.cloudme.com/v1/webshares/12885457505/CloudComputing/Cloud%20Computing/Artificial%20Genetic%20Algorithms/Practical%20Genetic%20Algorithms%20-%20Randy%20L.%20Haupt,%20Sue%20Ellen%20Haupt.pdf