by Matt McInvale on WordPress.org
Easily create navigation to sibling pages. Similar to next_post_link() and previous_post_link() but for pages.
Next Page, Not Next Post is a very simple plugin that creates navigation between sibling pages.
This plugin gives you two new functions, next_page_not_post($anchor_text, $loop, $sort) & previous_page_not_post($anchor_text, $loop, $sort). Each function has three simple options.
SHORTCODES You can use [next_page] and [previous_page] shortcodes within your page content. Supported options are ‘anchor’, ‘loop’ and ‘getPagesQuery’.
More documentation for Next Page, Not Next Post on BinaryM.com