PERIWINKLE BOOKS. (2012). PERIWINKLE GENERAL KNOWLEDGE - BOOK 7. PERIWINKLE PUBLICATIONS.
芝加哥风格引文PERIWINKLE BOOKS. PERIWINKLE GENERAL KNOWLEDGE - BOOK 7. PERIWINKLE PUBLICATIONS, 2012.
MLA引文PERIWINKLE BOOKS. PERIWINKLE GENERAL KNOWLEDGE - BOOK 7. PERIWINKLE PUBLICATIONS, 2012.
警告：这些引文格式不一定是100％准确.