Church Symbolism: An Explanation of the more Important Symbols of the Old and New Testament, the Primitive, the Mediaeval and the Modern Church by Frederick Roth Webber (2nd. edition, 1938). p.77. "[1]" (به انگلیسی).{{cite web}}: نگهداری یادکرد:نامهای متعدد:فهرست نویسندگان (link)
Church Symbolism: An Explanation of the more Important Symbols of the Old and New Testament, the Primitive, the Mediaeval and the Modern Church by Frederick Roth Webber (2nd. edition, 1938). p.97. «[2]».نگهداری یادکرد:نامهای متعدد:فهرست نویسندگان (رده)
"[3]". Church Symbolism: An Explanation of the more Important Symbols of the Old and New Testament, the Primitive, the Mediaeval and the Modern Church by Frederick Roth Webber (2nd. edition, 1938). p.93 (به انگلیسی).
