DAVID AND GLOVER, P. (2007). EASY LEARNING COUNTING PRACTICE AGE 5 - 7.
芝加哥风格引文DAVID AND GLOVER, PENNY. EASY LEARNING COUNTING PRACTICE AGE 5 - 7. 2007.
MLA引文DAVID AND GLOVER, PENNY. EASY LEARNING COUNTING PRACTICE AGE 5 - 7. 2007.
警告：这些引文格式不一定是100％准确.