Hopkins , W. C., & Williams, D. L. (1968). Converting factors for Southern pine products. State University.
芝加哥风格引文Hopkins , William C., 与 David L. Williams. Converting Factors for Southern Pine Products. Louisiana: State University, 1968.
MLA引文Hopkins , William C., 与 David L. Williams. Converting Factors for Southern Pine Products. State University, 1968.
警告：这些引文格式不一定是100％准确.