Which part of a document contains information about the references used?

The bibliography is the correct choice because it specifically lists all the sources that were referenced or consulted in the creation of the document. It provides readers with a way to identify, locate, and further explore the works cited in the text. A well-formatted bibliography typically includes details such as the authors, titles, publication dates, and publishers, which help to give credit to original authors and support the writer's arguments or findings.

In contrast, a table of contents outlines the main sections and structure of a document but does not provide information about the sources used. An abstract summarizes the main points of the document itself, giving a brief overview of the content without discussing references. The appendix may contain supplementary material or additional data that supports the main text but does not serve the same purpose as a bibliography.