龚勋. (2012). 感恩朋友: Real friendship will be treasured by us for ever. 汕头大学出版社.
Chicago (17e ed.) Bronvermelding龚勋. 感恩朋友: Real Friendship Will Be Treasured by Us for Ever. 汕头大学出版社, 2012.
MLA (8e ed.) Bronvermelding龚勋. 感恩朋友: Real Friendship Will Be Treasured by Us for Ever. 汕头大学出版社, 2012.
Let op: Deze citaties zijn niet altijd 100% accuraat.