Ryan, P. F. (1960). Recent fertiliser drilling experiments with cereals.
Lua i Stíl Chicago (17ú heag.)Ryan, P. F. Recent Fertiliser Drilling Experiments with Cereals. 1960.
Lua MLA (9ú heag.)Ryan, P. F. Recent Fertiliser Drilling Experiments with Cereals. 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
