Interdisciplinary is acceptable. But the most important thing is to prepare for the postgraduate entrance examination and prepare for studying this course in the future. I will also list some books that may be helpful to you:

China Toponymy History Research China/Shandong Pictorial Publishing House /202 1-3

Toponymy is a discipline that specializes in the origin, emergence, development and evolution of geographical names, involving the origin, generic names, naming and renaming rules, location, characters and pronunciation of geographical names, including the five elements of sound, shape, meaning, position and category of geographical names.

Wandering in the Historical Place Ding Chao/Commercial Press /20 16- 12

From the perspective of sociology of science, this book explores the development of modern historical geography in China through historical reduction and logical reconstruction.

I want to help you prepare.