OCKERMAN, H. (1988). Animal By Product Processing. VCH and Ellis Horword.
Lua i Stíl Chicago (17ú heag.)OCKERMAN, HW. Animal By Product Processing. VCH and Ellis Horword, 1988.
Lua MLA (8ú heag.)OCKERMAN, HW. Animal By Product Processing. VCH and Ellis Horword, 1988.
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