Cita APA (7th ed.)

Hall, C. A., & Holbrook, L. L. (2007). Introduction to the geology of southern California and its native plants. University of California Press.

Cita Chicago (17th ed.)

Hall, Clarence A., i Lauri L. Holbrook. Introduction to the Geology of Southern California and Its Native Plants. Berkeley: University of California Press, 2007.

Cita MLA (9th ed.)

Hall, Clarence A., i Lauri L. Holbrook. Introduction to the Geology of Southern California and Its Native Plants. University of California Press, 2007.