Egan, Ferol (1985). Sand in a whirlwind: The Paiute Indian War of 1860. (University of Nevada Press). pp. 23–24. ISBN0-87417-097-4. Partial online text of book accessed 2008-01-25.
"Peter Lassen". Den Store Danske. Retrieved December 25, 2015.
doi.org
Swartzlow, Ruby Johnson (1939). "Peter Lassen, Northern California's Trail-Blazer". California Historical Society Quarterly. 18 (4): 291–314. doi:10.2307/25160837. ISSN0008-1175. JSTOR25160837.
Davis, William Newell Jr. (September 1942). "The Territory of Nataqua: an Episode in Pioneer Government East of the Sierra". California Historical Society Quarterly. 1 (3): 225–28. doi:10.2307/25161008. JSTOR25161008.
handle.net
hdl.handle.net
Clar, C. Raymond (1959). California Government and forestry. Vol. 1. Sacramento: Division of Forestry, Department of Natural Resources State of California. p. 36. hdl:2027/mdp.39015006895208.
Swartzlow, Ruby Johnson (1939). "Peter Lassen, Northern California's Trail-Blazer". California Historical Society Quarterly. 18 (4): 291–314. doi:10.2307/25160837. ISSN0008-1175. JSTOR25160837.
Davis, William Newell Jr. (September 1942). "The Territory of Nataqua: an Episode in Pioneer Government East of the Sierra". California Historical Society Quarterly. 1 (3): 225–28. doi:10.2307/25161008. JSTOR25161008.
Some contemporary sources spelled Lassen's name "Lawson" (not to be confused with 1849 gold-country map-maker J. T. Lawson), including Fremont guide Kit Carson in his memoir.
sierracollege.edu
Tim I. Purdy (2009). "Lassen Trail". Sierra College. Archived from the original on November 12, 2015. Retrieved December 25, 2015.