Cross, I. Music as an emergent exaptation: Ian Cross. Music, language, and human evolution.(2012).
Chicago-Zitierstil (17. Ausg.)Cross, Ian. "Music as an Emergent Exaptation: Ian Cross." Music, Language, and Human Evolution.(2012) .
MLA-Zitierstil (8. Ausg.)Cross, Ian. "Music as an Emergent Exaptation: Ian Cross." Music, Language, and Human Evolution.(2012), .
警告：这些引文格式不一定是100％准确.