Penguins: Lifestyle, habitat, feeding, behavior / Daniel Gilpin.
芝加哥风格引文Penguins: Lifestyle, Habitat, Feeding, Behavior / Daniel Gilpin.
MLA引文Penguins: Lifestyle, Habitat, Feeding, Behavior / Daniel Gilpin.
警告：这些引文格式不一定是100％准确.
APA引文