Humphreys, Milton W. (1887). "The Agon of the Old Comedy". The American Journal of Philology. 8 (2): 179–206. doi:10.2307/287385. JSTOR287385.
Alm, Irene (April 1989). "Stravinsky, Balanchine, and Agon: An Analysis Based on the Collaborative Process". The Journal of Musicology. 7 (2): 254–269. doi:10.2307/763771. JSTOR763771.
Humphreys, Milton W. (1887). "The Agon of the Old Comedy". The American Journal of Philology. 8 (2): 179–206. doi:10.2307/287385. JSTOR287385.
Alm, Irene (April 1989). "Stravinsky, Balanchine, and Agon: An Analysis Based on the Collaborative Process". The Journal of Musicology. 7 (2): 254–269. doi:10.2307/763771. JSTOR763771.