ebrary, Inc, & Cowell, H. A. (2011). Physical activity guidelines for Americans and a review of scientific literature used. Nova Science Publishers.
芝加哥风格引文ebrary, Inc, 与 Hailey A. Cowell. Physical Activity Guidelines for Americans and a Review of Scientific Literature Used. Hauppauge, N.Y.: Nova Science Publishers, 2011.
MLA引文ebrary, Inc, 与 Hailey A. Cowell. Physical Activity Guidelines for Americans and a Review of Scientific Literature Used. Nova Science Publishers, 2011.
警告：这些引文格式不一定是100％准确.