Extra Google fonts not loading

Hi all, I’m trying to add two extra fonts following the functions option you have but I don’t see the fonts in the heading or body dropdown menus.

Here’s the code I added in functions.php:

add_filter( ‘avf_google_heading_font’, ‘avia_add_heading_font’);
function avia_add_heading_font($fonts)
{
$fonts[‘Rufina’] = ‘Rufina:400,700’;
return $fonts;
}

add_filter( ‘avf_google_content_font’, ‘avia_add_content_font’);
function avia_add_content_font($fonts)
{

$fonts[‘Source Sans Pro’] = ‘Source Sans Pro:400,200,200italic,300,300italic,400italic,600,600italic,700,700italic,900,900italic’;
return $fonts;
}

Let me know if I have to add extra code in order to get these fonts.