Não informado. Summary of operations, California oil fields. Department of Natural Resources, Division of Oil and Gas.
Citação do estilo Chicago (17ª ed.)Não informado. Summary of Operations, California Oil Fields. San Francisco, Calif: Department of Natural Resources, Division of Oil and Gas.
Citação MLA (8ª ed.)Não informado. Summary of Operations, California Oil Fields. Department of Natural Resources, Division of Oil and Gas.
Atenció: Aquestes cites poden no estar 100% correctes.