Williamson, R A.(1987). The USA and international competition in space transportation. Space Policy, 3(2), 115-121. doi:10.1016/0265-9646(87)90008-7
MLA CitationWilliamson, Ray A. "The USA and International Competition in Space Transportation". Space Policy, 3.2 ( 1987 ): 115-121.
Remember to check citations for accuracy before including them in your work.