"Early California History"(PDF). Los Angeles County Arboretum & Botanic Garden. Archived from the original(PDF) on December 24, 2010. Retrieved September 9, 2009.
"Governance". arboretum.org. Retrieved August 2, 2020.
"Early California History"(PDF). Los Angeles County Arboretum & Botanic Garden. Archived from the original(PDF) on December 24, 2010. Retrieved September 9, 2009.