<https://www.absolutecolour.com.au/featured_item/a4-perfect-bound-book-printing-service/>
<http://schema.org/description>
"A4 perfect bound book printing with a square, printable spine and the cover is usually made from paper or cardstock that is heavier than the interior pages."
<https://www.absolutecolour.com.au/featured_item/a4-perfect-bound-book-printing-service/>