One or more of the preceding sentences incorporates text from a publication now in the public domain: Flett, John Smith; Spencer, Leonard James (1911). "Scapolite". In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 24 (11th ed.). Cambridge University Press. pp. 300–301.
Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press