Shell Company of the Philippines, Ltd. (1959). Survey of activities: Shell in the Philippines, 1959. s.n.
Cita Chicago (17th ed.)Shell Company of the Philippines, Ltd. Survey of Activities: Shell in the Philippines, 1959. [Manila: s.n, 1959.
Cita MLA (9th ed.)Shell Company of the Philippines, Ltd. Survey of Activities: Shell in the Philippines, 1959. s.n, 1959.
Atenció: Aquestes cites poden no estar 100% correctes.