APA (7th ed.) Zitazioa

English, P. R., Smith, W. J., & Maclean, A. (1977). The sow improving her efficiency. Farming.

Chicago Style (17th ed.) Zitazioa

English, Peter R., William J. Smith, eta Alastair Maclean. The Sow Improving Her Efficiency. Londres: Farming, 1977.

MLA (9th ed.) Zitazioa

English, Peter R., et al. The Sow Improving Her Efficiency. Farming, 1977.