sujitkumar87

WP Post Contributors plugin allows you to add more than one author to the post who have contributed. 
The contributors meta will apear just aside of your post body. Just check the authors who have contibuted. 
And update the post to save it.
Features of Custom News Widget:
<ul>
<li>User friendly and easy to use.</li>
<li>Tested with other popular plugins.</li>
<li>Add authors to the post easily.</li>
</ul>

WP Post Contributor

WP Post Contributors plugin allows you to add more than one author to the post who have contributed.

ashishodich

WP SimplePost Contributors plugin allows you to add more than one author to the post.
<h3>Usage</h3>
Simply go to add or edit post page and the contributors list will apear just aside of your post body. Just check the authors who have contibuted and publish or update the post. 
Contributor list will be display below the post content.

WP Post Contributor vs WP SimplePost Contributors