龚勋. (2009). 世界之最: Complete book of the world records. 云南教育出版社.
Chicago (17e ed.) Bronvermelding龚勋. 世界之最: Complete Book of the World Records. 云南教育出版社, 2009.
MLA (8e ed.) Bronvermelding龚勋. 世界之最: Complete Book of the World Records. 云南教育出版社, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.