Rutherford, Ian (2007). "Trouble in Snake-Town: interpreting an oracle from Hierapolis-Pamukkale". In Swain, Simon; Harrison, Stephen; Elsner, Jaś (eds.). Severan Culture. Cambridge University Press. p. 450. ISBN9780521859820.
Sergio Negria and Giovanni Leucc (November 2006). "Geophysical investigation of the Temple of Apollo (Hierapolis, Turkey)". Journal of Archaeological Science. 33 (11): 1505–1513. Bibcode:2006JArSc..33.1505N. doi:10.1016/j.jas.2006.02.003.
Sergio Negria and Giovanni Leucc (November 2006). "Geophysical investigation of the Temple of Apollo (Hierapolis, Turkey)". Journal of Archaeological Science. 33 (11): 1505–1513. Bibcode:2006JArSc..33.1505N. doi:10.1016/j.jas.2006.02.003.