Ketchum, P. A. (1988). Mikrobiology Concepts And Applications Student Study Guide Paul A. Ketchum. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Ketchum, Paul A. Mikrobiology Concepts And Applications Student Study Guide Paul A. Ketchum. John Wiley and Sons, 1988.
Lua MLA (8ú heag.)Ketchum, Paul A. Mikrobiology Concepts And Applications Student Study Guide Paul A. Ketchum. John Wiley and Sons, 1988.
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