Brown, W. R. (1977). Earth science: A search for understanding: teacher's annotated edition. J.B. Lippincott.
Chicago-čujuhus (17. p.)Brown, Walter R. Earth Science: A Search for Understanding: Teacher's Annotated Edition. J.B. Lippincott, 1977.
MLA-čujuhus (9. p.)Brown, Walter R. Earth Science: A Search for Understanding: Teacher's Annotated Edition. J.B. Lippincott, 1977.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.