奥姆. (2009). 地球·火星: Let's explore Earth, Let's explore Mars. 四川少年儿童出版社.
Chicago (17e ed.) Bronvermelding奥姆. 地球·火星: Let's Explore Earth, Let's Explore Mars. 四川少年儿童出版社, 2009.
MLA (8e ed.) Bronvermelding奥姆. 地球·火星: Let's Explore Earth, Let's Explore Mars. 四川少年儿童出版社, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.