Não informado. (2001). Pig improvement services. Meat and Livestock Commission.
Style de citation Chicago (17e éd.)Não informado. Pig Improvement Services. Bletchley, Inglaterra: Meat and Livestock Commission, 2001.
Style de citation MLA (8e éd.)Não informado. Pig Improvement Services. Meat and Livestock Commission, 2001.
Attention : ces citations peuvent ne pas être correctes à 100%.