Common price display in the page category product

Hi,
to display the "common price" in displaying products in category (in the same way that the product page) which files I have to change?
What are the .php file which display the product page and what to display products in category in order to copy the code?

Thanks

Thanks for your reply. I found the code in the listing_img_title.php file.
However, I am struggling with the proper code to insert there.
the code is:

<!-- PRODUCT PRICE ORIGINALE -->
<?php
}
if($this->params->get('show_price','-1')=='-1'){
	$config =& hikashop_config();
	$this->params->set('show_price',$config->get('show_price'));
}
if($this->params->get('show_price')){
	$this->setLayout('listing_price');
	echo $this->loadTemplate();
}
?>
<!-- EO PRODUCT PRICE -->