G. S. Parsonson. The Settlement of Oceania: An Examination of the Accidental Voyage Theory // Journal of the Polynesian Society, Auckland University, 1962. Архивиран от оригинала на 2019-09-12. Посетен на 2018-05-13. The natives of Yap in Micronesia went 300 miles to the Palau Islands for „stone money“, great calcite disks, six to twelve feet in diameter.
G. S. Parsonson. The Settlement of Oceania: An Examination of the Accidental Voyage Theory // Journal of the Polynesian Society, Auckland University, 1962. Архивиран от оригинала на 2019-09-12. Посетен на 2018-05-13. The natives of Yap in Micronesia went 300 miles to the Palau Islands for „stone money“, great calcite disks, six to twelve feet in diameter.
Friedman, Milton. The Island of Stone Money // Working Papers in Economics E-91-3. 1991. Архивиран от оригинала на 2017-12-15. Посетен на 2018-05-13.