龚勋. (2009). 十万个为什么: Knowledge for the students. 云南教育出版社.
Chicago Style (17th ed.) Citation龚勋. 十万个为什么: Knowledge for the Students. 云南教育出版社, 2009.
MLA citiranje龚勋. 十万个为什么: Knowledge for the Students. 云南教育出版社, 2009.
Opozorilo: Ti citati niso vedno 100% točni.