马志强 & 宋青平. (2009). 教会宝宝睡觉: Teach your child to sleep. 山东科学技术出版社.
Chicago Style (17th ed.) Citation马志强 and 宋青平. 教会宝宝睡觉: Teach Your Child to Sleep. 山东科学技术出版社, 2009.
MLA (8th ed.) Citation马志强 and 宋青平. 教会宝宝睡觉: Teach Your Child to Sleep. 山东科学技术出版社, 2009.
Warning: These citations may not always be 100% accurate.