Whittemore, C. T. (1987). Elements of pig science. Longman.
Lua i Stíl Chicago (17ú heag.)Whittemore, Colin T. Elements of Pig Science. Burnt Mill, Harlow, Essex, U. K.: Longman, 1987.
Lua MLA (9ú heag.)Whittemore, Colin T. Elements of Pig Science. Longman, 1987.
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