Primitive Time-reckoning / A study in the origins and first development of the art of counting time among the primitive and early culture peoples

by Martin P. Nilsson

[499] Du Bois, pp. 162 ff.

[500] Columbus, p. 635.

[501] von den Steinen, Zentralbras., pp. 359 ff., 436, 513.

[502] Krause, p. 340.

[503] Teschauer, pp. 734 ff.

[504] Nordenskiöld, Indianlif, p. 273, Indianer och hvita, p. 173.

[505] Ehrenreich, pp. 44 f., 72.

[506] Molina, pp. 319 f.

[507] Spieth, p. 557.

[508] Thomas, Ibo, p. 127.