Thanks for your answer.
I suppose you mean booklibrary.php and booklibrary.html.php (instead of "vehiclemanager.php" and "vehiclemanager.html.php".
So, i do it but i have a error message:
"Parse error: parse error, expecting `T_FUNCTION' in C
ampphtdocscclcomponentscom_booklibrarybooklibrary.html.php on line 424"
I add "bl.NumberOfPages" and "bl.price" in booklibrary.php as you can see on the printscrean:
And in "booklibrary.html.php" I add some lines as you can see in the next printscrean in the next message