A threat to the peace :
North Viet-Nam's effort to conquer South Viet-Nam.

APA Citation

United States. Department of State. Office of Public Services. (1961). A threat to the peace: North Viet-Nam's effort to conquer South Viet-Nam. [Washington]: Dept. of State.

MLA Citation

United States. Department of State. Office of Public Services. A Threat to the Peace: North Viet-Nam's Effort to Conquer South Viet-Nam. [Washington]: Dept. of State, 1961.

Warning: These citations may not always be complete (especially for serials).