Hello there! There are plenty of books written on guerrilla warfare. Is there anything specific that you're looking for? A great introduction to the topic is Ian F.W. Beckett's Modern Insurgencies and Counter-Insurgencies. Guerrillas and their Opponents since 1750 which provides you with a more recent overview (and with a particular emphasis on the 20th century). This will engage you with both guerrilla warfare and counterinsurgency which often go hand-in-hand. What is particularly important about this book is that it is well-researched and based on modern scholarship. This contrasts quite heavily with Max Boot's books who has continuously been criticized by historians for being of quite poor scholarship.