Hi,
With commercial version of HikaShop (HikaShop essential and HikaShop Business) you can create "product custom fields".
It allow you to extend the product fields and create your own.
At this moment you can add new fields for the "author" and "ISBN/ISSN".
These fields will be editable while you will edit the product (or your vendors using HikaMarket) and these field will be displayed in the product page.
Do not hesitate to test it in our demo website.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.