Não informado. Summary of operations, California oil fields. Department of Natural Resources, Division of Oil and Gas.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Summary of Operations, California Oil Fields. San Francisco, Calif: Department of Natural Resources, Division of Oil and Gas.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Summary of Operations, California Oil Fields. Department of Natural Resources, Division of Oil and Gas.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.