Westfall, P. P. (1949). On the leech and its use in medicine. s.n..
Lua i Stíl Chicago (17ú heag.)Westfall, Paul Peter. On the Leech and Its Use in Medicine. [S.l.: s.n., 1949.
Lua MLA (8ú heag.)Westfall, Paul Peter. On the Leech and Its Use in Medicine. s.n., 1949.
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