Richard K. Betts. Statement and testimony on nuclear proliferation implications of foreign investment in U.S. firms, in U.S. House of Representatives, Committee on Government Operations, Subcommittee on Commerce, Consumer, and Monetary Affairs, Hearings: Federal Response to OPEC Country Investments in the United States, 97th Cong., 1st sess., 1981. 

Statement and testimony on nuclear proliferation implications of foreign investment in U.S. firms, in U.S. House of Representatives, Committee on Government Operations, Subcommittee on Commerce, Consumer, and Monetary Affairs, Hearings: Federal Response to OPEC Country Investments in the United States, 97th Cong., 1st sess., 1981.