How to Convert Kindle KFX to Epub/PDF/Mobi with Calibre
Converting non-Amazon eBooks and sending them to your Kindle using Calibre | Jake Lee on Software
Converting files with Calibre (Kindle) « eBook Conversion
Is it possible to configure Calibre to automatically convert certain ebooks-formats automatically into the mobi format when adding to the libary? - Quora
How To Transfer any book format to KINDLE using CALIBRE - YouTube
Converting files with Calibre (Kindle) « eBook Conversion