1. AHMED, F.R., WORLD LIST CRYSTALLO: 52 (1966).
2. CHRIST, C.L., CRYSTAL CHEMISTRY AND SYSTEMATIC CLASSIFICATION OF HYDRATED BORATE MINERALS, AMERICAN MINERALOGIST 45: 334 (1960).
3. CLARK, J.R., STUDIES OF BORATE MINERALS .7. X-RAY STUDIES OF AMMONIOBORITE, LARDERELLITE, AND THE POTASSIUM AND AMMONIUM PENTABORATE TETRAHYDRATES, AMERICAN MINERALOGIST 44: 1150 (1959).
4. COULSON, C.A., B-O BOND LENGTHS IN BORON-OXYGEN COMPOUNDS, ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL CRYSTALLOGRAPHY AND CRYSTAL CHEMISTRY 24: 153 (1968).
5. DAVIES, M.F., A SCATTERING CURVE FOR A SPHERICALLY SYMMETRICAL AMMONIUM ION, ACTA CRYSTALLOGRAPHICA 21: 822 (1966).