Beauchamp, W. L. (1957). Discovering our world, science for the midle grades. Scott, Foresman ang Comp.
Lua i Stíl Chicago (17ú heag.)Beauchamp, Wilbur L. Discovering Our World, Science for the Midle Grades. Scott, Foresman ang Comp, 1957.
Lua MLA (8ú heag.)Beauchamp, Wilbur L. Discovering Our World, Science for the Midle Grades. Scott, Foresman ang Comp, 1957.
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