无弦. (2009). D级危楼: Before gabriel's trumpet sounds. 宁夏人民出版社.
Chicago (17e ed.) Bronvermelding无弦. D级危楼: Before Gabriel's Trumpet Sounds. 宁夏人民出版社, 2009.
MLA (8e ed.) Bronvermelding无弦. D级危楼: Before Gabriel's Trumpet Sounds. 宁夏人民出版社, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.