Cushman, Joseph A. 1881-1949 Foraminifera : their classification and economic use / by Joseph A. Cushman - 4th ed., rev. and enl., with an illustrated key to the genera - Cambridge, Mass. : Harvard University Press, 1969 - viii, 605 p. : ill. ; 25 cm. Bibliography: p. 377-443 Subjects--Topical Terms: ForaminiferaForaminifera, FossilForaminifera--Bibliography