Ackerman. The Perpetual Motion Machine. Red Hen Press.
芝加哥风格引文Ackerman. The Perpetual Motion Machine. Red Hen Press.
MLA引文Ackerman. The Perpetual Motion Machine. Red Hen Press.
警告：这些引文格式不一定是100％准确.
APA引文
Ackerman. The Perpetual Motion Machine. Red Hen Press.
芝加哥风格引文Ackerman. The Perpetual Motion Machine. Red Hen Press.
MLA引文Ackerman. The Perpetual Motion Machine. Red Hen Press.