von Huene, Roland, Gerta Keller, Michael Arthur, J. Barron, Gary Bell, Jean-Paul Cadet, Bobb Carson, et al. 1980. “Site 441: Japan Trench Lower Slope, Leg 57”. v. 56 and 57. Initial Reports, Deep Sea Drilling Project. Referenced from deepseadrilling.org: Site 441: Japan Trench Lower Slope, Leg 57.

von Huene, Roland, Gerta Kelle, Michael Arthur, Noriyuki Nasu, J. Barron, Gary Bell, Jean-Paul Cadet, et al. 1980. “Site 440: Japan Trench Midslope Terrace, Leg 57”. v. 56 and 57. Initial Reports, Deep Sea Drilling Project.