Loken, N. C., & Willoughby, R. J. Complete book of gymnastics.
芝加哥风格引文Loken, Newton C., 与 Robert J. Willoughby. Complete Book of Gymnastics.
MLA引文Loken, Newton C., 与 Robert J. Willoughby. Complete Book of Gymnastics.
警告：这些引文格式不一定是100％准确.
APA引文