National Geographic Society (U.S.). Cartographic Division., Garver, J. B., Jr., Darley, R. J., & Shupe, J. F. (1983). Arctic Ocean. Washington, D.C. :: The Society.
Dyfyniad Arddull ChicagoNational Geographic Society (U.S.). Cartographic Division., John B. Garver, Jr, Richard J. Darley, and John F. Shupe. Arctic Ocean. Washington, D.C. :: The Society, 1983.
Dyfyniad MLANational Geographic Society (U.S.). Cartographic Division., John B. Garver, Jr, Richard J. Darley, and John F. Shupe. Arctic Ocean. Washington, D.C. :: The Society, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.