Clyde Robert Bulla. (1982). Daniel's Duck (I Can Read Level 3). HarperCollins.
芝加哥风格引文Clyde Robert Bulla. Daniel's Duck (I Can Read Level 3). HarperCollins, 1982.
MLA引文Clyde Robert Bulla. Daniel's Duck (I Can Read Level 3). HarperCollins, 1982.
警告：这些引文格式不一定是100％准确.