To prevent the spread of nuclear weapons :
the United States draft treaty to prevent the spread of nuclear weapons.

APA Citation

United States. Arms Control and Disarmament Agency. (1965). To prevent the spread of nuclear weapons: the United States draft treaty to prevent the spread of nuclear weapons. [Washington, D.C.: The Agency : for sale by the Supt. of Docs., U.S. Govt. Print. Off..

MLA Citation

United States. Arms Control and Disarmament Agency. To Prevent the Spread of Nuclear Weapons: the United States Draft Treaty to Prevent the Spread of Nuclear Weapons. [Washington, D.C.: The Agency : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1965.