books from that period about strategy and war ?

Dec 2018
I learnt that some military school teach still use "The Art of War" of Sun Tzu. (along with some more modern ones like "On War" from Carl Von Clausewitz)

So I would like to ask if there are some books of the same kind written in antiquity and still relevant nowadays in such studies ?

Also, how much relevant would they still be ?

I understand why "The Art of War" is still relevant and interesting to study even nowadays for some parts, bu what about the rest ?

(I would prefer occidental ones, but oriental ones should be okay too.)

Thanks for the Help.