Dyfyniad APA

Callmer, J. (1977). Trade beads and bead trade in Scandinavia, ca. 800-1000 A.D. Rudolf Habelt Verlag.

Dyfyniad Arddull Chicago

Callmer, Johan. Trade Beads and Bead Trade in Scandinavia, Ca. 800-1000 A.D. Bonn: Rudolf Habelt Verlag, 1977.

Dyfyniad MLA

Callmer, Johan. Trade Beads and Bead Trade in Scandinavia, Ca. 800-1000 A.D. Rudolf Habelt Verlag, 1977.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.