↑ Hyman,Libbie Henrietta(1940).The invertebrates: Protozoa through Ctenophora.McGraw-Hill
↑ Hedley RH(1963).“Cement and iron in the arenaceious foraminifera”.Micropaleontology(The Micropaleontology Project, Inc.)9(4): 433–441.doi:10.2307/1484505.JSTOR1484505.