Picton, J. A. (1886). The essential nature of religion. s.n.].
Lua i Stíl Chicago (17ú heag.)Picton, J. Allanson. The Essential Nature of Religion. [S.l.: s.n.], 1886.
Lua MLA (8ú heag.)Picton, J. Allanson. The Essential Nature of Religion. s.n.], 1886.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.