(1987). International science and technology data update 1987. Washington: National Science Fuondation.
Trích dẫn kiểu ChicagoInternational Science and Technology Data Update 1987. Washington: National Science Fuondation, 1987.
MLA引文International Science and Technology Data Update 1987. Washington: National Science Fuondation, 1987.
警告:这些引文格式不一定是100%准确.