APA-referens (7:e uppl.)
Hall, C. A., & Holbrook, L. L. (2007). Introduction to the geology of southern California and its native plants. University of California Press.
Chicago-referens (17:e uppl.)
Hall, Clarence A., och Lauri L. Holbrook. Introduction to the Geology of Southern California and Its Native Plants. Berkeley: University of California Press, 2007.
MLA-referens (9:e uppl.)
Hall, Clarence A., och Lauri L. Holbrook. Introduction to the Geology of Southern California and Its Native Plants. University of California Press, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.