Roldan, C. A. (2005). The ultimate echo guide. Lippincott Williams & Wilkins.
芝加哥风格引文Roldan, Carlos A. The Ultimate Echo Guide. Philadelphia: Lippincott Williams & Wilkins, 2005.
MLA引文Roldan, Carlos A. The Ultimate Echo Guide. Lippincott Williams & Wilkins, 2005.
警告：这些引文格式不一定是100％准确.