What is very important and must go in at the end of a research paper.?back, cover, spine or first page?

The back cover is not typically included in a research paper. The most important element that must go at the end of a research paper is the bibliography or list of references. This section provides a list of all the sources that were cited or consulted during the research process. It is important to give credit to the original authors and sources of information used in the paper.

Spine