Christensen,Howard B. (1977). Statistics step by step. Houghton Mifflin.
芝加哥风格引文Christensen,Howard B. Statistics Step by Step. Atlanta: Houghton Mifflin, 1977.
MLA引文Christensen,Howard B. Statistics Step by Step. Houghton Mifflin, 1977.
警告：这些引文格式不一定是100％准确.