This is a bit difficult.
First of all, it is an ancient book.
The landlord's problem has a limitation, that is, literary classification.
Zhouyi is not a literary work.
Can't be classified according to poetry and novels.
here
On China's Traditional Studies
A subset of China's traditional research history
If it is a document, it should be assigned to the collection department.
The Book of Changes belongs to the classic department.
In the modern sense.
This is a reference book.
Such as dictionaries, philosophical reference materials and so on.