Clarkson, K. W. (1977). Intangible capital and rates of return: Effects of research and promotion on profitability. American Enterprise Institute for Public Policy Research.
芝加哥风格引文Clarkson, Kenneth W. Intangible Capital and Rates of Return: Effects of Research and Promotion on Profitability. Washington: American Enterprise Institute for Public Policy Research, 1977.
MLA引文Clarkson, Kenneth W. Intangible Capital and Rates of Return: Effects of Research and Promotion on Profitability. American Enterprise Institute for Public Policy Research, 1977.
警告：这些引文格式不一定是100％准确.