looking for where clean journal pro style sheet is called from

I'm following instructions to combine all my css stylesheets (except clean journal pro style sheets) into one. THe generic instructions say to look in the theme's header.php or functions.php for a line of code like this <link rel=”stylesheet” href=”<?php bloginfo(‘stylesheet_url’); ?>” type=”text/css” media=”screen” /> Once i find that then i would add my custom stylesheet (custom_plugins.date.css) that has all the other stylesheets from the other plugins combined together as an additional item shown below. This line would go under the above line that points to Clean Journal Pro's main stylesheet. <link rel=”stylesheet” href=”http://www.yourdomainname.com/includes/css/custom_plugins.date.css” type=”text/css” media=”screen” /> My problem is that I can not find where in the header.php or functions.php where Clean Journal Pro's style.css is called (ie can not find this-><link rel=”stylesheet” href=”<?php bloginfo(‘stylesheet_url’); ?>” type=”text/css” media=”screen” /> to add new line ---><link rel=”stylesheet” href=”http://www.yourdomainname.com/includes/css/custom_plugins.date.css” type=”text/css” media=”screen” /> Can you tell me where (what file and how clean journal pro style.css is called). Thanks. M