Ziefert, H., & Plecas, J. (2000). Grandpas are for finding worms. Puffin Books.
芝加哥风格引文Ziefert, Harriet, 与 Jennifer Plecas. Grandpas Are for Finding Worms. New York, NY: Puffin Books, 2000.
MLA引文Ziefert, Harriet, 与 Jennifer Plecas. Grandpas Are for Finding Worms. Puffin Books, 2000.
警告：这些引文格式不一定是100％准确.