Hoekstra, A. H. (1968). The chemistry and luminescence of antimony-containing calcium chlorapatite,. Philips Research Laboratories.
Lua i Stíl Chicago (17ú heag.)Hoekstra, Age Hylke. The Chemistry and Luminescence of Antimony-containing Calcium Chlorapatite,. [Eindhoven: Philips Research Laboratories, 1968.
Lua MLA (8ú heag.)Hoekstra, Age Hylke. The Chemistry and Luminescence of Antimony-containing Calcium Chlorapatite,. Philips Research Laboratories, 1968.
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