On line I found the following. I don't know Backhouse
from the outhouse but I do think Oxford UP is
respected.
A. E. Backhouse. 1993. The Japanese Language:
An Introduction. Oxford University Press
Backhouse (1993, pp 7476) estimates that
54% of Japanese vocabulary is Sino-Japanese,
6% of western origin and the remaining 40%
native
The majority of Japanese vocabulary IS from Chinese
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