APA引文

36 FLASH CARDS APPLE TREE NUMBERS. APPLE BOOKS.

芝加哥风格引文

36 FLASH CARDS APPLE TREE NUMBERS. FLASH CARDS; NUMBERS: APPLE BOOKS.

MLA引文

36 FLASH CARDS APPLE TREE NUMBERS. APPLE BOOKS.

警告：这些引文格式不一定是100％准确.