Okada, Hisatake (1980): Calcareous nannofossils from Deep Sea Drilling Project sites 442 through 446, Philippine Sea. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Klein, George de Vries, Kobayashi, Kazuo, Chamley, Herve, Curtis, Doris, Dick, Henry, Echols, Dorothy Jung, Fountain, David M., Kinoshita, Hajimu, Marsh, Nicholas G., Mizuno, Atsuyuki, Nisterenko, Gennady V., Okada, Hisatake, Sloan, Jon R., Waples, Douglas, White, Stan M., Stout, Larry N. (editor), Leg 58 of the cruises of the drilling vessel Glomar Challenger; Yokahama, Japan to Okinawa, Japan; December, 1977-January, 1978, 58, 549-565, georefid:1981-011410