Ordway, R. J. (1966). Earth science. Affiliated.
Chicago-čujuhus (17. p.)Ordway, Richard J. Earth Science. New Delhi: Affiliated, 1966.
MLA-čujuhus (9. p.)Ordway, Richard J. Earth Science. Affiliated, 1966.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.