Freitag, B. (2017). Sheela-na-gigs: Unravelling an enigma. Routledge.
芝加哥风格引文Freitag, Barbara. Sheela-na-gigs: Unravelling an Enigma. Abingdon, Oxon: Routledge, 2017.
MLA引文Freitag, Barbara. Sheela-na-gigs: Unravelling an Enigma. Routledge, 2017.
警告:这些引文格式不一定是100%准确.