Catherine Hapka. (2011). Pony Scouts: Back in the Saddle (I Can Read Level 2) (I Can Read Book 2.). HarperCollins.
芝加哥风格引文Catherine Hapka. Pony Scouts: Back in the Saddle (I Can Read Level 2). I Can Read Book 2. HarperCollins, 2011.
MLA引文Catherine Hapka. Pony Scouts: Back in the Saddle (I Can Read Level 2). I Can Read Book 2. HarperCollins, 2011.
警告：这些引文格式不一定是100％准确.