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The world heritage of gardens by Dusan Ogrin is a great one. Amazon link: https://www.amazon.com/World-Heritage-Gardens-Dusan-Ogrin/dp/0500236666

It takes a historic perspective and goes through all of the important eras of garden design, describing how basic design principles such as contrast, harmony, rythm etc. were used to convey different messages. It won't provide you with any recepies for designing but it is still great to understand historical significance of landscape structures. Highly recommended to anyone dealing with landscape design.

Another one I would recommend, but which is more general is The cultured landscape. https://www.amazon.com/Cultured-Landscape-Designing-Environment-Century/dp/0419250409 This one is a bit more philosophical but great to understand where landscape architecture is moving in general.

Enjoy your reading.