APA引文

Westfall, P. P. (1949). On the leech and its use in medicine. s.n..

Chicago Style (17th ed.) Citation

Westfall, Paul Peter. On the Leech and Its Use in Medicine. [S.l.: s.n., 1949.

MLA引文

Westfall, Paul Peter. On the Leech and Its Use in Medicine. s.n., 1949.