APA

United Nations, Permanent Court of Arbitration, . (2001). Permanent Court of Arbitration optional rules for arbitration of disputes relating to natural resources and/or the environment. The Hague: International Bureau of the Permanent Court of Arbitration.

Chicago

United Nations, Permanent Court of Arbitration, . 2001. Permanent Court of Arbitration optional rules for arbitration of disputes relating to natural resources and/or the environment. The Hague: International Bureau of the Permanent Court of Arbitration.

Harvard

United Nations, Permanent Court of Arbitration, . (2001). Permanent Court of Arbitration optional rules for arbitration of disputes relating to natural resources and/or the environment. The Hague: International Bureau of the Permanent Court of Arbitration.

MLA

United Nations, Permanent Court of Arbitration, . Permanent Court of Arbitration optional rules for arbitration of disputes relating to natural resources and/or the environment. The Hague: International Bureau of the Permanent Court of Arbitration. 2001.