- Sir Arthur Conan Doyle. The Sign of the Four. N/A: Project Gutenberg, 2000.
- CrashCourse. "Imperialism: Crash Course World History #35." YouTube. September 20, 2012. 6/20/2020. <https://youtu.be/alJaltUmrGo>.
- CrashCourse. "Expansion and Resistance: Crash Course European History #28." YouTube. December 3, 2019. 6/15/2020. <https://www.youtube.com/watch?v=eBA7P-zKbi8>.
- Stanford Encyclopedia of Philosophy. "Colonialism." Stanford.edu. August 29, 2017. 6/15/2020. <...
Join Now to View Premium Content
GradeSaver provides access to 2368 study guide PDFs and quizzes, 11017 literature essays, 2791 sample college application essays, 926 lesson plans, and ad-free surfing in this premium content, “Members Only” section of the site! Membership includes a 10% discount on all editing orders.