Ruppert, E. E., & Barnes, R. D. (1994). Invertebrate zoology (6th ed.). Saunders College Pub.
Lua i Stíl Chicago (17ú heag.)Ruppert, Edward E., agus Robert D. Barnes. Invertebrate Zoology. 6th ed. Fort Worth: Saunders College Pub, 1994.
Lua MLA (9ú heag.)Ruppert, Edward E., agus Robert D. Barnes. Invertebrate Zoology. 6th ed. Saunders College Pub, 1994.
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