I would like to have the authors name saparated by ; instead of , in the category listing. I managed to do it in search results, and book details, but not in category listing.

See the image for details

Thanks in advance for your support.

Hi BeniaminQB,
ok, this is the only one solution.

Hi cutare,
open the file <your_site>/components/com_abook/models/category.php
modify the row n°198 from:
$query = "SELECT idbook, GROUP_CONCAT(name ORDER BY name ASC SEPARATOR ', ') AS author "to:
$query = "SELECT idbook, GROUP_CONCAT(name ORDER BY name ASC SEPARATOR '; ') AS author "
open the file <your_site>/components/com_abook/models/search.php
modify the row n°193 from:
$query = "SELECT idbook, GROUP_CONCAT(name ORDER BY name ASC SEPARATOR ', ') AS author "to:
$query = "SELECT idbook, GROUP_CONCAT(name ORDER BY name ASC SEPARATOR '; ') AS author "
open the file <your_site>/components/com_abook/models/author.php
modify the row n°139 from:
$this->_authorname = implode(', ', $this->_authorname);to:
$this->_authorname = implode('; ', $this->_authorname);