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