How do you spell "Huaxia" in Oracle Bone Inscriptions? Are there any books on this subject?

The word "Huaxia" doesn't have the shape of Oracle Bone Inscriptions. Because these two words did not come into being in Oracle Bone Inscriptions's time.

There are two types of Oracle Bone Inscriptions:

(1) Oracle Bone Inscriptions with yin deficiency represents Shang culture. In Shang culture, there is no concept of "China". Businessmen call it "Xia people" earthwork.

(2) Joo Won?'s Oracle Bone Inscriptions represents the pre-Zhou culture. In pre-Zhou culture, there was no concept of "China". "China" and "Huaxia" came into being after Zhou Dynasty.

So it is unscientific to write "Huaxia" in Oracle Bone Inscriptions.

You can check the Chinese Dictionary. The prefixes of Oracle Bone Inscriptions are all listed as Oracle bones.