Smith 2000, p. 230. Smith, Peter (2000). "Síyáh-Chál". A concise encyclopedia of the Baháʼí Faith. Oxford: Oneworld Publications. pp. 323–267. ISBN1-85168-184-1.
Smith 2000, pp. 79–86. Smith, Peter (2000). "Síyáh-Chál". A concise encyclopedia of the Baháʼí Faith. Oxford: Oneworld Publications. pp. 323–267. ISBN1-85168-184-1.