CHAPTER III - PROCEDURE
Article 39
1. The official languages of the Court shall be French and English. If the parties agree that the case shall be conducted in French, the judgment shall be delivered in French. If the parties agree that the case shall be conducted in English, the judgment shall be delivered in English.
2. In the absence of an agreement as to which language shall be employed, each party may, in the pleadings, use the language which it prefers; the decision of the Court shall be given in French and English. In this case the Court shall at the same time determine which of the two texts shall be considered as authoritative.
3. The Court shall, at the request of any party, authorize a language other than French or English to be used by that party.
http://www.icj-cij.org/documents/index.php?p1=4&p2=2&p3=0
Article 39
1. The official languages of the Court shall be French and English. If the parties agree that the case shall be conducted in French, the judgment shall be delivered in French. If the parties agree that the case shall be conducted in English, the judgment shall be delivered in English.
2. In the absence of an agreement as to which language shall be employed, each party may, in the pleadings, use the language which it prefers; the decision of the Court shall be given in French and English. In this case the Court shall at the same time determine which of the two texts shall be considered as authoritative.
3. The Court shall, at the request of any party, authorize a language other than French or English to be used by that party.
http://www.icj-cij.org/documents/index.php?p1=4&p2=2&p3=0