Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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