I solved it myself.
for someone who might need it: add this code to your product list template file:
{foreach from=Product::getProductCategoriesParent($product.id_product, [add here the book authors category ID]) item=cat}
<a href="{$link->getCategoryLink({$cat.id_category})}" title="{$cat.name}">{$cat.name}{if !$cat@last},{/if}</a>
{/foreach}
{if} statement is in case if a book has more than one author
this solution works in PS 8.2
I solved it myself.
for someone who might need it: add this code to your product list template file:
{foreach from=Product::getProductCategoriesParent($product.id_product, [add here the book authors category ID]) item=cat}
<a href="{$link->getCategoryLink({$cat.id_category})}" title="{$cat.name}">{$cat.name|escape:'htmlall'|nl2br nofilter}{if !$cat@last},{/if}</a>
{/foreach}
{if} statement is in case if a book has more than one author
this solution works in PS 8.2
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