马永佳. 年轮城的秘密: Secrets of the tree-ring city. 河北少年儿童出版社.
Dyfyniad Arddull Chicago马永佳. 年轮城的秘密: Secrets of the Tree-ring City. 河北少年儿童出版社.
Dyfyniad MLA马永佳. 年轮城的秘密: Secrets of the Tree-ring City. 河北少年儿童出版社.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.