==Hiroshi Shirai== 
 Thank you for your note, AvdN. You will probably find Wikipedia:Verifiability helpful. Personal communications would not count as reliable sources, although a case could probably be made if the source is available on-line (e.g., if I remember correctly, the Wong Shun Leung article has a scanned image of a letter from Bruce Lee as a source). If something does not have a published source, you could leave it in, but another contributor might challenge and remove it. If there was a disagreement in that situation, you would have to discuss it on the article's talk page and try to reach consensus. Trust this helps.