Youssef, Duha Thamer, and Idris Hardan Mahmoud. “German Immigrants to the United States of America - John Sutter and His Role in the Discovery of California Gold, 1839-1888”. Journal of Tikrit University for Humanities 31, no. 1 (January 21, 2024): 414–429. Accessed August 5, 2026. https://jtuh.org/index.php/jtuh/article/view/3089.