Skinner,Brain J. (1969). Earths History, Stucture and Materials (10th ed.). WILLIAM KAUFMANN.
Chicago-čujuhus (17. p.)Skinner,Brain J. Earths History, Stucture and Materials. 10th ed. California: WILLIAM KAUFMANN, 1969.
MLA-čujuhus (9. p.)Skinner,Brain J. Earths History, Stucture and Materials. 10th ed. WILLIAM KAUFMANN, 1969.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.