Cruickshank, D. W. J.; Kálmán, A.; Stephens, J. S. (1978). "A Reinvestigation of Sodium Metagermanate". Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 34 (4): 1333–1334. Bibcode:1978AcCrB..34.1333C. doi:10.1107/S0567740878005488.
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Cruickshank, D. W. J.; Kálmán, A.; Stephens, J. S. (1978). "A Reinvestigation of Sodium Metagermanate". Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 34 (4): 1333–1334. Bibcode:1978AcCrB..34.1333C. doi:10.1107/S0567740878005488.