Geological Survey (U.S.) & Sarna-Wojcicki, A. M. (2005). Tephra layers of Blind Spring Valley and related upper Pliocene and Pleistocene tephra layers, California, Nevada, and Utah: Isotopic ages, correlation, and magnetostratigraphy. U.S. Dept. of the Interior, U.S. Geological Survey.
Չիկագոյի ոճի (17րդ խմբ.) մեջբերումGeological Survey (U.S.) and Andrei M. Sarna-Wojcicki. Tephra Layers of Blind Spring Valley and Related Upper Pliocene and Pleistocene Tephra Layers, California, Nevada, and Utah: Isotopic Ages, Correlation, and Magnetostratigraphy. Denver, CO: U.S. Dept. of the Interior, U.S. Geological Survey, 2005.
MLA (8րդ խմբ.) ՄեջբերումGeological Survey (U.S.) and Andrei M. Sarna-Wojcicki. Tephra Layers of Blind Spring Valley and Related Upper Pliocene and Pleistocene Tephra Layers, California, Nevada, and Utah: Isotopic Ages, Correlation, and Magnetostratigraphy. U.S. Dept. of the Interior, U.S. Geological Survey, 2005.