APA
Keller M., Schwalbach J. & U.S.Geological Survey.Strontium isotope evidence for the age of the vaqueros formation and latest oligocene marine transgression in the Northern Santa Maria Province. : .
Chicago
Keller Margaret, Schwalbach Jon and U.S.Geological Survey.Strontium isotope evidence for the age of the vaqueros formation and latest oligocene marine transgression in the Northern Santa Maria Province. : .
Harvard
Keller M., Schwalbach J. and U.S.Geological Survey.Strontium isotope evidence for the age of the vaqueros formation and latest oligocene marine transgression in the Northern Santa Maria Province. : .
MLA
Keller Margaret, Schwalbach Jon and U.S.Geological Survey.: . .