奥姆. (2009). 地球·火星: Let's explore Earth, Let's explore Mars. 四川少年儿童出版社.
Dyfyniad Arddull Chicago奥姆. 地球·火星: Let's Explore Earth, Let's Explore Mars. 四川少年儿童出版社, 2009.
Dyfyniad MLA奥姆. 地球·火星: Let's Explore Earth, Let's Explore Mars. 四川少年儿童出版社, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.