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2. Alling,H.L. (1926): The potash-soda feldspars. JG 34, 591–611.
3. Ansilewski,J. (1961): The problem of classification of the alkali feldspars. Arch. Mineral. 23, 5–59.
4. Aoki,K. (1959): Petrology of alkali rocks of the Iki Islands and Higashi-matsuura district. Japan. Sci. Rept. Tôhôku Univ., 3rd ser. 6, 261–310.
5. Bailey,S.W. (1954): Ph. D. thesis. Cambridge University, England.