Including multiple php files into a wordpress page.

I have created content that goes through a database and accesses information to then display it in multiple test files. I want to migrate this over to a page on a wordpress website. I have created a custom page page-slug.php and have inserted code for the basic html part, which is working fine, however I am having trouble getting the other php files it needs to access recognized by the include statements. It is working perfect when I have all of the files just displaying the content on the test url. I just need it to access my files such as connect.php, query.php, etc. I have placed the files into the wordpress custom theme folder as well. I also need the file to reference a couple jquery files as well as my php ones.