John Grogan. (2011). Marley: Messy Dog (I Can Read Level 2) (Reprint.). HarperCollins.
芝加哥风格引文John Grogan. Marley: Messy Dog (I Can Read Level 2). Reprint. HarperCollins, 2011.
MLA引文John Grogan. Marley: Messy Dog (I Can Read Level 2). Reprint. HarperCollins, 2011.
警告：这些引文格式不一定是100％准确.