No a link back is not necessary.

But in order to facilitate the review of your press release you are welcome to link back your website to pressoclock.com.

How to Link Back to Pressoclock web site?

The link back to Pressoclock.com on your web site should look exactly like the example below and the image must be linked to http://www.pressoclock.com.
Copy one of the linking codes below and insert the copied html code to the place on your web page, where you want the link to Pressoclock.com to appear on your page. Please do not modify the html code provided.

<a title="Pressoclock.com" href="http://www.pressoclock.com" target="_blank"><img src="http://www.pressoclock.com/images/stories/pressoclock-468.png" border="0" alt="Pressoclock logo 468" title="Logo Pressoclock 468" /></a>

<a title="Pressoclock.com" href="http://www.pressoclock.com" target="_blank"><img src="http://www.pressoclock.com/images/stories/pressoclock-234.png" border="0" alt="Pressoclock logo 234" title="Pressoclock logo 234" /></a>

<a title="Pressoclock.com" href="http://www.pressoclock.com" target="_blank"><img src="http://www.pressoclock.com/images/stories/pressoclock-120.png" border="0" alt="Pressoclock logo 120" title="Pressoclock logo 120" /></a>