Committee, S. (1989). Hearings before the subcommittee on International Scientific Cooperation of the Committee on Science, Space, and Technology U. S. House of Representatives: One hundred first congress. Washington: Superintendent o Documents, Congressional Sales Office.
Dyfyniad Arddull ChicagoCommittee, Space. Hearings Before the Subcommittee On International Scientific Cooperation of the Committee On Science, Space, and Technology U. S. House of Representatives: One Hundred First Congress. Washington: Superintendent o Documents, Congressional Sales Office, 1989.
Dyfyniad MLACommittee, Space. Hearings Before the Subcommittee On International Scientific Cooperation of the Committee On Science, Space, and Technology U. S. House of Representatives: One Hundred First Congress. Washington: Superintendent o Documents, Congressional Sales Office, 1989.