Most natural
一本书
Used for bound books, notebooks, and similar printed volumes read as a single physical object.
Why 本 · běn ? View classifier
我买了一本书。
I bought a book.
a physical bound volume for reading
for book
一本书
Used for bound books, notebooks, and similar printed volumes read as a single physical object.
Why 本 · běn ? View classifier
我买了一本书。
I bought a book.
一册书
Used for individual copies or installments of a published work.
一个书
Understandable but not natural in standard Mandarin. Use 一本书 instead.
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