Steffen, M. R. (1915). Special cattle therapy. American journal of veterinary therapy.
Lua i Stíl Chicago (17ú heag.)Steffen, Martin Robert. Special Cattle Therapy. Chicago: American journal of veterinary therapy, 1915.
Lua MLA (9ú heag.)Steffen, Martin Robert. Special Cattle Therapy. American journal of veterinary therapy, 1915.
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