Twentieth Century Fund. Task Force on International Satellite Communications & Laskin, P. L. (1969). Communicating by satellite ; report of the Twentieth Century Fund Task Force in International Satellite Communications. Background paper by Paul L. Laskin. Twentieth Century Fund.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Twentieth Century Fund. Task Force on International Satellite Communications و Paul L. Laskin. Communicating by Satellite ; Report of the Twentieth Century Fund Task Force in International Satellite Communications. Background Paper by Paul L. Laskin. New York: Twentieth Century Fund, 1969.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Twentieth Century Fund. Task Force on International Satellite Communications و Paul L. Laskin. Communicating by Satellite ; Report of the Twentieth Century Fund Task Force in International Satellite Communications. Background Paper by Paul L. Laskin. Twentieth Century Fund, 1969.