马永佳. 年轮城的秘密: Secrets of the tree-ring city. 河北少年儿童出版社.
Chicago Style (17th ed.) Citation马永佳. 年轮城的秘密: Secrets of the Tree-ring City. 河北少年儿童出版社.
Cita 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.
Atenció: Aquestes cites poden no estar 100% correctes.