ASHBY, J.R. & MINCH, J.A. (1984)
The upper pliocene San Diego Formation and the occurrence of Carcharodn megalodon at La Joya, Tijuana, Baja California, Mexico. in: Minch, J. A. and J. R. Ashby (eds.). Miocene and Cretaceous Depositional Environments Northwestern Baja California, Mexico. Annual Meeting Pacific Section AAPG San Diego, California April 18–21, 1984, 54: 19–27