Não informado. Summary of operations, California oil fields. Department of Natural Resources, Division of Oil and Gas.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Summary of Operations, California Oil Fields. San Francisco, Calif: Department of Natural Resources, Division of Oil and Gas.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Summary of Operations, California Oil Fields. Department of Natural Resources, Division of Oil and Gas.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.