Walker Sally M. (2010). Early Bird Earth Science Fossils. Lerner.
芝加哥风格引文Walker Sally M. Early Bird Earth Science Fossils. Lerner, 2010.
MLA引文Walker Sally M. Early Bird Earth Science Fossils. Lerner, 2010.
警告：这些引文格式不一定是100％准确.
APA引文