Somerville, W. (1913). Agriculture. Williams and Norgate.
Lua i Stíl Chicago (17ú heag.)Somerville, William. Agriculture. London: Williams and Norgate, 1913.
Lua MLA (8ú heag.)Somerville, William. Agriculture. Williams and Norgate, 1913.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.