Howard, J L., Pollastro, R M., McLean, H., & Zink, L L. (1995). Conglomerates of the Upper Middle Eocene to Lower Miocene Sespe Formation along the Santa Ynez Fault - implications for the geologic history of the eastern Santa Maria Basin Area, California. Washington, DC: United States Government Printing Office.

Conglomerates of the Upper Middle Eocene to Lower Miocene Sespe Formation along the Santa Ynez Fault - implications for the geologic history of the eastern Santa Maria Basin Area, California / by Jeffrey L. Howard . — Washington, DC : United States Government Printing Office, 1995. — V, H37, I13 S.; Ill., graph. Darst. — (Evolution of sedimentary basins - Santa Maria Province ; H/I)

Howard, Jeffrey L., Richard M. Pollastro, Hugh McLean, and Laura L. Zink. Conglomerates of the Upper Middle Eocene to Lower Miocene Sespe Formation Along the Santa Ynez Fault - Implications for the Geologic History of the Eastern Santa Maria Basin Area, California.Washington, DC: United States Government Printing Office, 1995.