Can we trust this source if the writer wasn't there?

How to say “Can we trust this source if the writer wasn't there?” in Japanese

In Japanese

書(か)いた本人(ほんにん)がその場(ば)にいなかったのに、この史料(しりょう)は信用(しんよう)できるの？

Kaita honnin ga sono ba ni inakatta noni, kono shiryō wa shinyō dekiru no?

Can we trust this source if the writer wasn't there? in other languages