Otto, J. H., & Blanc, S. S. (1951). Biology investigations: A workbook and laboratory manual (Rev. ed.). Holt, Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)Otto, James Howard, agus Sam S. Blanc. Biology Investigations: A Workbook and Laboratory Manual. Rev. ed. New York: Holt, Rinehart and Winston, 1951.
Lua MLA (8ú heag.)Otto, James Howard, agus Sam S. Blanc. Biology Investigations: A Workbook and Laboratory Manual. Rev. ed. Holt, Rinehart and Winston, 1951.
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